Python学习笔记——函数：返回值返回值

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返回值

在python中，通常使用return语句将值返回到调用函数的代码行；主要用于简化主程序。

返回简单值

一个简单的例子。

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def city_countrys(city, country):
    city_country = city + ' , ' + country
    return city_country

city_country = city_countrys("wuhan", "hubei")
print(city_country)

实参为可选值

一个简单的例子。

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def make_album(singer_name, album_name, album_num = ''):
    if album_num:
        make_albums = {'singer':singer_name, 'album':album_name, 'num':album_num}
    else:
        make_albums = {'singer':singer_name, 'album':album_name}
    return make_albums


album1 = make_album(singer_name = "jay", album_name = "fantastic")
print(album1)

album2 = make_album(singer_name = "jay", album_name = "fantastic", album_num = 20)
print(album2)

易错点

上述程序在使用过程中有涉及到字典，请务必注意字典的定义

函数与while循环结合实例

一个简单的例子。

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#定义函数
def make_album(singer_name, album_name, album_num = ''):
    if album_num:
        make_albums = {'singer':singer_name, 'album':album_name, 'num':album_num}
    else:
        make_albums = {'singer':singer_name, 'album':album_name}
    return make_albums


#while循环调用函数，并且让用户自定义输入
while True:
    print("nPlease input your favorit singer, album's name and number:")
    print("(If you input 'quit', you can quit this question.)")
    s_name = input("singer:")
    if s_name == 'quit':
        break
    a_name = input("album:")
    if a_name == 'quit':
        break
    m_album = make_album(s_name, a_name)
    print(m_album)