如何替换列表中的值 [英] How to replace a value in a list

问题描述

程序要求用户输入5个唯一号码，如果该号码已在列表中，则要求输入一个新号码.输入5个唯一编号后，显示列表

the program asks user to enter 5 unique number, if the number is already in the list, ask for a new number. after 5 unique numbers have been entered, display the list

numbers = ['1','2','3','4','5']
count = 0
index = 0
while count <6:
    user = raw_input ("Enter a number: ")
    if user in numbers:
        print "not unique"
    if user not in numbers:
        print "unique"
        count += 1
        numbers = numbers.replace(index,user)
        index +=1
    print numbers

程序进入替换方法时，会引发属性错误

when the program gets to the replace method, it raise an attribute error

推荐答案

您可以使用:

numbers[index] = user

列表没有replace()方法.字符串确实具有替换方法.

A list doesn't have a replace() method. A string does have a replace method however.

如果希望在列表末尾添加数字，则可以使用append():

If you wish to append a number to the end of a list, you can use append():

numbers.append(user)

如果希望在给定位置插入数字，则可以使用insert()(例如，位置0):

If you wish to insert a number at a given position, you can use insert() (for example, position 0):

numbers.insert(0, user)

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