改变列表中的内容

改变列表中的内容

错误示范：

    for magician in magicians:
        magician = 'the Great ' + magician

以上并不能改变列表的值

正确方法：

    for i in range(0,len(magicians)):
        magicians[i] = 'the Great ' + magicians[i]

补充:range

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range(start_number,end_number,the length of a step)

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