Windows上的奇怪路径分隔符 [英] Strange path separators on Windows

问题描述

我正在运行此代码:

#!/usr/bin/python      coding=utf8
#  test.py = to demo fault
def loadFile(path):
    f = open(path,'r')
    text = f.read()
    return text
if __name__ == '__main__':
    path = 'D:\work\Kindle\srcs\test1.html'
    document = loadFile(path)
    print len(document)

它给了我一个引用

D:\work\Kindle\Tests>python.exe test.py
Traceback (most recent call last):
  File "test.py", line 11, in <module>
    document = loadFile(path)
  File "test.py", line 5, in loadFile
    f = open(path,'r')
IOError: [Errno 22] invalid mode ('r') or filename: 'D:\\work\\Kindle\\srcs\test1.html'

D:\work\Kindle\Tests>

如果我将路径行更改为

path = 'D:\work\Kindle\srcs\\test1.html'

(请注意双\\)，一切正常.

(note the double \\) it all works fine.

为什么?分隔符是'\'还是不是，不是混合?

Why? Either the separator is '\' or it is not, not a mix?

系统. Windows 7、64位， Win32上的Python 2.7(r27:82525，2010年7月4日，09:01:59)[MSC v.1500 32位(Intel)]

System. Windows 7, 64bit, Python 2.7 (r27:82525, Jul 4 2010, 09:01:59) [MSC v.1500 32 bit (Intel)] on win32

已选中-所有反斜杠均正确显示.

Checked - and all the backslashes appear correctly.

推荐答案

当下一个字符组合产生特殊含义时，反斜杠是转义字符.请看以下示例:

The backslash is an escape character when the next character combination would result in a special meaning. Take the following examples:

>>> '\r'
'\r'
>>> '\n'
'\n'
>>> '\b'
'\x08'
>>> '\c'
'\\c'
>>>

当

r，n和b都带有反斜杠时，都具有特殊含义.对于t同样如此，这将产生一个制表符.您可能需要A.将所有反斜杠加倍以保持一致性，因为'\\'会产生一个反斜杠，或者B使用原始字符串:r'c:\path\to\my\file.txt'.前面的r会提示解释器不要将反斜杠评估为转义序列，从而防止\t出现在制表符中.

r, n, and b all have special meanings when preceded by a backslash. The same is true for t, which would produce a tab. You either need to A. Double all your backslashes, for consistency, because '\\' will produce a backslash, or, B, use raw strings: r'c:\path\to\my\file.txt'. The preceding r will prompt the interpreter not to evaluate back slashes as escape sequences, preventing the \t from appearing as a tab.

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