导语：
本文主要介绍了关于python命令行模式的使用流程的相关知识，包括python执行系统命令，以及ubuntu18进入命令行模式这些编程知识，希望对大家有参考作用。
1、使用cmd打开命令行窗口。
2、在输入python时，进入python交互模式。
3、输入exit()，退出交互模式，在命令行模式下运行.py程序。
实例
C:\Users\86178>python
Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> edit
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'edit' is not defined
>>> exit()
C:\Users\86178>python
Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> hello.py
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined
>>> exit()
C:\Users\86178>python hello.pu
python: can't open file 'hello.pu': [Errno 2] No such file or directory
C:\Users\86178>python hello.py
python: can't open file 'hello.py': [Errno 2] No such file or directory
C:\Users\86178>cd /d
文件名、目录名或卷标语法不正确。
C:\Users\86178>cd /d D:
D:\>python hello.py
hello
D:\>python
Python 3.8.3 (default, Jul 2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> hello.py
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined
>>>
本文教程操作环境：windows7系统、Python 3.9.1，DELL G3电脑。
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