这道题什么意思啊,没看懂,请帮我讲一下吧…… - V2EX
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Loop680
V2EX    Python

这道题什么意思啊,没看懂,请帮我讲一下吧……

  •  
  •   Loop680 2015-03-10 15:58:25 +08:00 3474 次点击
    这是一个创建于 3935 天前的主题,其中的信息可能已经有所发展或是发生改变。
    The len() function is used to count how many characters a string contains.
    Get the first half of the string stored in the variable 'phrase'.
    Note: Remember about type conversion.

    phrase = """
    It is a really long string
    triple-quoted strings are used
    to define multi-line strings
    """
    first_half = ???????
    print(first_half)

    就是问???那里写什么,我一直没搞懂first_half指什么。
    6 条回复    2015-03-10 16:49:39 +08:00
    cloverstd
        1
    cloverstd  
       2015-03-10 16:16:24 +08:00   1
    first_half = phrase[:len(phrase)]
    我想是这样的
    stupidcat
        2
    stupidcat  
       2015-03-10 16:18:06 +08:00   1
    half嘛 就是一半 first half就是前面一半 所以len()/2 再切片就好 是不是我想得太简单了
    lingxi27
        3
    lingxi27  
       2015-03-10 16:21:25 +08:00   1
    phrase[0:len(phrase)//2]

    截取前半部分,大概是这个意思吧
    Loop680
        4
    Loop680  
    OP
       2015-03-10 16:24:32 +08:00
    @cloverstd
    @stupidcat
    @lingxi27
    多谢多谢,就是这样哈。
    mengjue
        5
    mengjue  
       2015-03-10 16:25:47 +08:00
    就是前半的意思,英语需要好好学习。
    first_half = phrase[:len(phrase)//2]应该就编译通过了。
    Loop680
        6
    Loop680  
    OP
       2015-03-10 16:49:39 +08:00
    @mengjue 我是直接用88/2写进去,太耿直了……
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