选自｜TowardsDataScience 作者｜Kunal Dhariwal
报道｜机器之心
<section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;">x = np.<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">12</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">10</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">12</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">9</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">16</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">4</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>])index_val = np.argpartition(x, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">-4</span>)[<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">-4</span>:]<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />index_val<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>], dtype=int64)np.sort(x[index_val])<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">10</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">12</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">12</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">16</span>])</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;">array1 = np.array([0.12,0.17,0.24,0.29])<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />array2 = np.array([0.13,0.19,0.26,0.31])<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># with a tolerance of 0.1, it should return False:</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />np.allclose(array1,array2,0.1)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />False<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># with a tolerance of 0.2, it should return True:</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />np.allclose(array1,array2,0.2)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />True<span style=""></span></section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;">x = np.<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">17</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">14</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">23</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">16</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>])np.clip(x,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>])</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"># Random integers<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span> = np.random.randint(<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">20</span>, size=<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">12</span>)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([ <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">19</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">16</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">18</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">10</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">11</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">13</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">14</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>])# Divide by <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span> <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">and</span> check <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">if</span> remainder <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">is</span> <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />cond = np.mod(<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>)==<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />cond<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">True</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">True</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">True</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">True</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">False</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">True</span>])# Use extract <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">to</span> <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">get</span> the values<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />np.extract(cond, <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([ <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">19</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">11</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">13</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>])# Apply condition <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">on</span> extract directly<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />np.extract(((<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span> < <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>) | (<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span> > <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">15</span>)), <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([ <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">19</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">16</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">18</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>])</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;">y = np.<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">7</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">9</span>])<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Where y is greater than 5, returns index position</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />np.where(y><span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">2</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">7</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>], dtype=int64),)<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># First will replace the values that match the condition, </span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># second will replace the values that does not</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />np.where(y><span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"Hit"</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"Miss"</span>)<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">array</span>([<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Miss </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Miss </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Hit </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Hit </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Miss </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Hit </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Miss </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Hit </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Hit </span>],dtype=<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> <U4 </span>)</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;">a = np.array([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">8</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">7</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6</span>,<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">9</span>])<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">print</span>(<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"50th Percentile of a, axis = 0 : "</span>, <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /> np.percentile(a, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">50</span>, axis =<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>))<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">50</span>th Percentile of a, axis = <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span> : <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">6.0</span>b = np.array(<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">[[10, 7, 4], [3, 2, 1]]</span>)<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">print</span>(<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"30th Percentile of b, axis = 0 : "</span>, <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /> np.percentile(b, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">30</span>, axis =<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>))<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">30</span>th Percentile of b, axis = <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span> : [<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">5.1</span> <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3.5</span> <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1.9</span>]</section>
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具有异构类型列的表格数据，如 SQL 表或 Excel 表；
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有序和无序 (不一定是固定频率) 的时间序列数据；
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带有行/列标签的任意矩阵数据（同构类型或者是异构类型）；
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其他任意形式的统计数据集。事实上，数据根本不需要标记就可以放入 Pandas 结构中。
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容易处理浮点数据和非浮点数据中的 缺失数据（用 NaN 表示）；
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大小可调整性: 可以从 DataFrame 或者更高维度的对象中插入或者是删除列；
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显式数据可自动对齐: 对象可以显式地对齐至一组标签内，或者用户可以简单地选择忽略标签，使 Series、 DataFrame 等自动对齐数据；
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灵活的分组功能，对数据集执行拆分-应用-合并等操作，对数据进行聚合和转换；
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简化将数据转换为 DataFrame 对象的过程，而这些数据基本是 Python 和 NumPy 数据结构中不规则、不同索引的数据；
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基于标签的智能切片、索引以及面向大型数据集的子设定；
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更加直观地合并以及连接数据集；
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更加灵活地重塑、转置（pivot）数据集；
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轴的分级标记 (可能包含多个标记)；
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具有鲁棒性的 IO 工具，用于从平面文件 (CSV 和 delimited)、 Excel 文件、数据库中加在数据，以及从 HDF5 格式中保存 / 加载数据；
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时间序列的特定功能: 数据范围的生成以及频率转换、移动窗口统计、数据移动和滞后等。
<section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;">import io<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />import requests<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># I am using this online data set just to make things easier for you guys</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />url = <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"https://raw.github.com/vincentarelbundock/Rdatasets/master/csv/datasets/AirPassengers.csv"</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />s = requests.get(url).content<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># read only first 10 rows</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />df = pd.read_csv(io.StringIO(s.decode( utf-8 )),nrows=10 , index_col=0)</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># create a dataframe</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">dframe</span> = pd.DataFrame(np.random.randn(<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">4</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">3</span>), columns=list(<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> bde </span>), index=[<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> India </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> USA </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> China </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Russia </span>])<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">#compute a formatted string from each floating point value in frame</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />changefn = lambda x: <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> %.2f </span> % x<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Make changes element-wise</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />dframe[<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> d </span>].map(changefn)</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># max minus mix lambda fn</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />fn = lambda x: x.max() - x.min()<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Apply this on dframe that we ve just created above</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />dframe.apply(fn)</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Using the dataframe we created for read_csv</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(165, 218, 45);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">filter1</span> = df[<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"value"</span>].isin([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">112</span>]) <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(165, 218, 45);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">filter2</span> = df[<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"time"</span>].isin([<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1949.000000</span>])df [filter1 & filter2]</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># creating sample series </span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />data = pd.Series([<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> India </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Pakistan </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> China </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Mongolia </span>])<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Assigning issue that we face</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />data1= data<br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Change a value</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />data1[<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">0</span>]=<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> USA </span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Also changes value in old dataframe</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />data<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># To prevent that, we use</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># creating copy of series </span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">new</span> = data.copy()<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># assigning new values </span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">new</span>[<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">1</span>]=<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Changed value </span><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># printing data </span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">print</span>(<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">new</span>) <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">print</span>(data)</section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># We ll use the same dataframe that we used for read_csv</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />framex = df.select_dtypes(<span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">include</span>=<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"float64"</span>)<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Returns only time column</span></section><section style="box-sizing: border-box;padding: 0.5em;font-size: 14px;color: rgb(169, 183, 198);line-height: 18px;border-radius: 0px;background: rgb(40, 43, 46);display: block;font-family: Consolas, Inconsolata, Courier, monospace;overflow-x: auto;letter-spacing: 0px;margin-left: 8px;margin-right: 8px;overflow-wrap: normal !important;word-break: normal !important;overflow-y: auto !important;"><span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Create a sample dataframe</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />school = pd.DataFrame({<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> A </span>: [<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Jay </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Usher </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Nicky </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Romero </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Will </span>], <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /> <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> B </span>: [<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Masters </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Graduate </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Graduate </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Masters </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> Graduate </span>], <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /> <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> C </span>: [<span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">26</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">22</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">20</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">23</span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(174, 135, 250);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">24</span>]})<span style="box-sizing: border-box;font-size: inherit;color: rgb(128, 128, 128);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"># Lets create a pivot table to segregate students based on age and course</span><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />table = pd.pivot_table(school, <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">values</span> =<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> A </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(248, 35, 117);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">index</span> =[<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> B </span>, <span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> C </span>], <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /> columns =[<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;"> B </span>], aggfunc = np.sum, fill_value=<span style="box-sizing: border-box;font-size: inherit;color: rgb(238, 220, 112);line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;">"Not Available"</span>) <br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" /><br style="box-sizing: border-box;font-size: inherit;color: inherit;line-height: inherit;overflow-wrap: inherit !important;word-break: inherit !important;" />table</section><section data-brushtype="text" style="padding-right: 0em;padding-left: 0em;white-space: normal;font-size: 16px;letter-spacing: 0.544px;color: rgb(62, 62, 62);font-family: "Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;widows: 1;word-spacing: 2px;caret-color: rgb(255, 0, 0);text-align: center;"><strong style="color: rgb(0, 0, 0);font-family: -apple-system-font, system-ui, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;"><span style="letter-spacing: 0.5px;font-size: 14px;"><strong style="font-size: 16px;letter-spacing: 0.544px;"><span style="letter-spacing: 0.5px;">—</span></strong>完<strong style="font-size: 16px;letter-spacing: 0.544px;"><span style="letter-spacing: 0.5px;font-size: 14px;"><strong style="font-size: 16px;letter-spacing: 0.544px;"><span style="letter-spacing: 0.5px;">—</span></strong></span></strong></span></strong></section><pre 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