为什么有个for name in great_magicians会重复打印内容？

magicians = ['mike','horse','bingo']
great_magicians = []
def make_great (magicians,great_magicians):
while magicians:
magician = magicians.pop()
great_magician = 'the Great ' + magician
great_magicians.append(great_magician)
def show_magicians(great_magicians):
for name in great_magicians:
print(great_magicians)
make_great(magicians[:],great_magicians)
show_magicians(great_magicians)
show_magicians(magicians)