Python学习第十篇——函数初步

 def make_album(name,album_name,song_nums = 1):
     dict_album =  {name:[album_name]}
     if int(song_nums) > 1:
         dict_album[name].append(song_nums)
     return dict_album
 first = make_album('Avril','Fly')
 print(str(first)+"\n")
 second = make_album('Jay Zhou','Jay Chou\'s bedside story',10)
 print(str(second)+"\n")
 third = make_album('Tall swift','welcome to New York',12)
 print(str(third)+"\n")
 while True:
     print("\nplease enter the information of album:")
     name = input("singer's name:")
     album_name = input("album's name:")
     song_nums = input("song's number:")
     album = make_album(name,album_name,song_nums)
     print(album)

上段代码描述了函数的定义和使用:

1.函数定义，用def关键字，注意函数定义的格式

2 函数的返回值可以是列表和字典，总之，是很丰富；这也从侧面反应了：函数的形参也可以是列表和字典

3 函数的形参可以有默认形参，但默认形参通常只能放在（）的最后面