导语：
本文主要介绍了关于Python中的返回值是什么的相关知识，希望可以帮到处于编程学习途中的小伙伴
返回值
函数并不总是直接显示输出，而是可以处理一些数据并返回一个值或一组值。函数的返回值称为返回值。
1. 简单的返回值
def get_formatted_name(first_name, last_name):
full_name = first_name + ' ' + last_name
return full_name.title()
musician = get_formatted_name('jimi', 'hendrix')
print(musician)调用返回值的函数时，需要提供一个变量来存储返回值。
2. 让实参变成可选的
def get_formatted_name(first_name, middle_name, last_name):
full_name = first_name + ' ' + middle_name + ' ' + last_name
return full_name.title()
musician = get_formatted_name('john', 'lee', 'hooker')
print(musician)然而，并不是每个人都有中间名，那么如何让中间名成为可选的呢？
def get_formatted_name(first_name, last_name, middle_name=' '):
if middle_name:
full_name = first_name + ' ' + middle_name + ' ' + last_name
else:
full_name = first_name + ' ' + last_name
return full_name.title()
musician = get_formatted_name('john', 'hooker', 'lee')
print(musician)
musician = get_formatted_name('jimi', 'hendrix')
print(musician)默认给参数中间名一个空字符，并将其移到参数列表的末尾；确保调用函数时实际参数的中间名在最后。
3. 返回字典
def build_person(first_name, last_name):
person = {'first': first_name, 'last': last_name}
return person
musician = build_person('jimi', 'hendrix')
print(musician)扩展函数，使其接受可选值
def build_person(first_name, last_name, age=' '):
person = {'first': first_name, 'last': last_name}
if age:
person['age'] = age
return person
musician = build_person('jimi', 'hendrix', age=27)
print(musician)
4. 结合使用函数和while循环
def get_formatted_name(first_name, last_name):
full_name = first_name + ' ' + last_name
return full_name.title()
while True:
print("\nPlease tell me your name:")
f_name = input("First name: ")
l_name = input("Last name: ")
formatted_name = get_formatted_name(f_name, l_name)
print("\nHello, " + formatted_name + "!")循环调用定义的函数，大家好！！！我应该在哪里提供发射？
def get_formatted_name(first_name, last_name):
full_name = first_name + ' ' + last_name
return full_name.title()
while True:
print("\nPlease tell me your name:")
print("(enter 'q' at any time to quit)")
f_name = input("First name: ")
if f_name == 'q':
break
l_name = input("Last name: ")
if l_name == 'q':
break
formatted_name = get_formatted_name(f_name, l_name)
print("\nHello, " + formatted_name + "!")每次提示用户输入时均可推出。
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