定义函数，大神帮忙看下哪里错了

Question

def show_magicians(magicians):     for magician in magicians:     print(magician) def make_great(magicians):     great_magicians = []     while magicians:         new_magician = magicians.pop()         great_magician = "the great " + new_magician         great_magicians.append(great_magician)     print(great_magicians) magician_list = ['ada1', 'jack1', 'mai1','tom1'] check_great = make_great(magician_list) #print(check_great) show_magicians(check_great)TypeError: 'NoneType' object is not iterable为什么会报错？为什么print（check_great）会返回none？make_great生成的列表为什么无法赋值给到check_great?我的目的是调用show_magicians函数打印出make_great函数生成的列表，应该怎样实现呢？

Answer 1

# 一共两处错误，已经在代码里标注了，下列代码实测可运行，应该能达到你的效果

def show_magicians(magicians):

    for magician in magicians:

        print(magician)       # 你没有缩进

 

def make_great(magicians):

    great_magicians = []

    while magicians:

        new_magician = magicians.pop()

        great_magician = "the great " + new_magician

        great_magicians.append(great_magician)

    return great_magicians    # print是没有返回值的，要用return

 

magician_list = ['ada1', 'jack1', 'mai1','tom1']

check_great = make_great(magician_list)

#print(check_great)

show_magicians(check_great)