for magician in magicians:
magician = ‘the Great ‘ + magician
以上并不能改变列表的值
for i in range(0,len(magicians)):
magicians[i] = ‘the Great ‘ + magicians[i]
range(start_number,end_number,the length of a step)
原文：https://www.cnblogs.com/yhzhao1/p/13364426.html