Question

编写一个函数music_func，它接受3个参数音乐类型，音乐组，歌手并将它们全部打印出来，如下例所示。

如果用户没有提供输入，该功能应该为参数设置以下值：＆＃34; Classic Rock＆＃34;，＆＃34;披头士＆＃34;，＆＃34; Freddie Mercury＆＃ 34。

例如：

输入：

Alternative Rock,Pearl Jam,Chris Cornell

输出：

The best kind of music is Alternative Rock
The best music group is Pearl Jam
The best lead vocalist is Chris Cornell

注意： print语句将进入music_func（）。例如：print("The best kind of music is" + ...)

#definition for music_func goes here
def music_func(a,b,c):
    if a is None or b is None or c is None:
        print("The best kind of music is Classic Rock")
        print("The best music group is The Beatles")
        print("The best lead vocalist is Freddie Mercury")
    else:
        print("The best kind of music is",a)
        print("The best music group is",b)
        print("The best lead vocalist is",c)
    return
def main():
    music, group, singer = input().split(',')
    music_func(music, group, singer)
    music_func() #This is suppose to print the first if-statements 
main()

Answer 1

您可以使用默认参数

def music_func(a="Beatles", b="Classic Rock", c="Freddie"):

现在调用没有参数的函数将默认使用这些选项

Python：如何在没有参数的情况下运行函数？

1 个答案: