Python 文字 r'\' 不被接受

Question

这个问题在这里已经有了答案:

Why can't Python's raw string literals end with a single backslash? (13 个回答)

关闭 上个月。

Python 中的

r'\' 无法按预期工作。它不是返回一个包含一个字符(反斜杠)的字符串，而是引发一个 SyntaxError。 r"\" 也一样。

如果你有这样的 Windows 路径列表，这会相当麻烦:

paths = [ r'\bla\foo\bar',
          r'\bla\foo\bloh',
          r'\buff',
          r'\',
          # ...
        ]

这个文字不被接受有充分的理由吗？

Answer 1

这是根据 documentation :

When an 'r' or 'R' prefix is present, a character following a backslash is included in the string without change, and all backslashes are left in the string. For example, the string literal r"\n" consists of two characters: a backslash and a lowercase 'n'. String quotes can be escaped with a backslash, but the backslash remains in the string; 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 string 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 string, not as a line continuation.

使用 "\\" 代替，或者，甚至更好的是，使用 / 作为路径分隔符(是的，这适用于 Windows)。