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eccentric579
V2EX  ›  Python

为什么 raw 的 r 禁止转义会失效呢

  •  
  •   eccentric579 · 2021-11-06 16:07:28 +08:00 · 2836 次点击
    这是一个创建于 1114 天前的主题,其中的信息可能已经有所发展或是发生改变。
    
    aim = {
        "official" : r"D:\下载\Temp\official\",
        "others" : r"D:\下载\Temp\others\"
    }
    
    

    屏幕截图 2021-11-06 160451.png

    8 条回复    2021-11-08 14:12:38 +08:00
    Dvel
        1
    Dvel  
       2021-11-06 16:26:09 +08:00
    原生字符串的结尾不能是 “反斜杠” + “引号” 。
    可以写成 r'D:\下载\Temp\official' + '\\'
    festoney8
        2
    festoney8  
       2021-11-06 16:26:55 +08:00
    leoleoasd
        3
    leoleoasd  
       2021-11-06 16:41:40 +08:00
    根据 python 文档:Even in a raw literal, quotes can be escaped with a backslash, but the backslash remains in the result; for example, r"\"" is a valid string literal consisting of two characters: a backslash and a double quote; r"\" is not a valid string literal (even a raw string cannot end in an odd number of backslashes). Specifically, a raw literal cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the literal, not as a line continuation.
    leoleoasd
        4
    leoleoasd  
       2021-11-06 16:41:49 +08:00
    Trim21
        5
    Trim21  
       2021-11-06 16:43:36 +08:00 via Android
    只有最后一个反斜杠会失效
    eccentric579
        6
    eccentric579  
    OP
       2021-11-06 16:48:20 +08:00
    谢谢楼上的各位
    2i2Re2PLMaDnghL
        7
    2i2Re2PLMaDnghL  
       2021-11-06 23:29:30 +08:00
    这是为了让 syntax 简单,把 raw 放到 semantic 层来实现。
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