Python用\替换\\ [英] Python Replace \\ with \

问题描述

所以我似乎无法弄清楚这一点...我有一个字符串说，a\\
b，我想要这样成为 a\\\
b。我已经尝试了以下所有操作，而且似乎没有工作;

So I can't seem to figure this out... I have a string say, "a\\nb" and I want this to become "a\nb". I've tried all the following and none seem to work;

>>> a
'a\\nb'
>>> a.replace("\\","\")
  File "<stdin>", line 1
    a.replace("\\","\")
                      ^
SyntaxError: EOL while scanning string literal
>>> a.replace("\\",r"\")
  File "<stdin>", line 1
    a.replace("\\",r"\")
                       ^
SyntaxError: EOL while scanning string literal
>>> a.replace("\\",r"\\")
'a\\\\nb'
>>> a.replace("\\","\\")
'a\\nb'

我真的不明白为什么最后一个工作，因为这样做很好：

I really don't understand why the last one works, because this works fine:

>>> a.replace("\\","%")
'a%nb'

Is there something I'm missing here?

编辑我明白\是一个转义字符。我想在这里做的是将所有 \\\\
\\t 等 \\\
\t 等等，替换似乎没有像我想象的那样工作。

EDIT I understand that \ is an escape character. What I'm trying to do here is turn all \\n \\t etc. into \n \t etc. and replace doesn't seem to be working the way I imagined it would.

>>> a = "a\\nb"
>>> b = "a\nb"
>>> print a
a\nb
>>> print b
a
b
>>> a.replace("\\","\\")
'a\\nb'
>>> a.replace("\\\\","\\")
'a\\nb'

我希望字符串a看起来像字符串b。但是替换不是像我以为这样替换斜线。

I want string a to look like string b. But replace isn't replacing slashes like I thought it would.

推荐答案

没有理由使用替换，Python来包括电池。您有一个编码字符串（使用 string_escape encoding），您要解码它：

There is no reason to use replace for this, Python comes with batteries included.

What you have is a encoded string (using the string_escape encoding) and you want to decode it:

>>> s = r"Escaped\nNewline"
>>> print s
Escaped\nNewline
>>> s.decode('string_escape')
'Escaped\nNewline'
>>> print s.decode('string_escape')
Escaped
Newline
>>> "a\\nb".decode('string_escape')
'a\nb'

在Python 3中：

In Python 3:

>>> import codecs
>>> codecs.decode('\\n\\x21', 'unicode_escape')
'\n!'

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