blocks|key|710265|text|你失踪了，那就是转义字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710266|看这里：http://docs.python.org/reference/lexical_analysis.html在2.4.1“逃逸序列”|offset|length|710267|最重要的是\n是换行符。是一个转义字符:D|710268|>>>+a+=+'a\\\\nb'
>>>+a
'a\\\\nb'
>>>+print+a
a\\nb
>>>+a.replace('\\\\',+'\\')
'a\\nb'
>>>+print+a.replace('\\\\',+'\\')
a\nb|code-block|syntax|javascript|710269|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/reference/lexical_analysis.html^0|0|4|1I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

You are missing, that \ is the escape character.

Look here: <a href="http://docs.python.org/reference/lexical_analysis.html">http://docs.python.org/reference/lexical_analysis.html</a>
at 2.4.1 "Escape Sequence"

Most importantly \n is a newline character.
And \\ is an escaped escape character :D

<pre><code>&gt;&gt;&gt; a = 'a\\\\nb'
&gt;&gt;&gt; a
'a\\\\nb'
&gt;&gt;&gt; print a
a\\nb
&gt;&gt;&gt; a.replace('\\\\', '\\')
'a\\nb'
&gt;&gt;&gt; print a.replace('\\\\', '\\')
a\nb
</code></pre>

blocks|key|710283|text|这是因为，即使在“原始”字符串中(=在开始引号之前带有r的字符串)，未转义转义字符也不能是字符串中的最后一个字符。相反，这应该是可行的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|710284|'\\+'[0]|code-block|syntax|javascript|710285|entityMap^0|R|1|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

It's because, even in "raw" strings (=strings with an <code>r</code> before the starting quote(s)), an unescaped escape character cannot be the last character in the string. This should work instead:

<pre><code>'\\ '[0]
</code></pre>

blocks|key|687968|text|在Python字符串文本中，反斜杠是转义字符。当交互式提示符显示字符串的值时，这也是正确的。它将给出字符串的文字代码表示形式。使用print语句查看字符串的实际外观。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|687969|这个例子显示了不同之处：|687970|>>>+'\\'
'\\'
>>>+print+'\\'
\|code-block|syntax|javascript|687971|entityMap^0|1T|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

In Python string literals, backslash is an escape character. This is also true when the interactive prompt shows you the value of a string. It will give you the literal code representation of the string. Use the <code>print</code> statement to see what the string actually looks like.

This example shows the difference:

<pre><code>&gt;&gt;&gt; '\\'
'\\'
&gt;&gt;&gt; print '\\'
\
</code></pre>

blocks|key|687983|text|r'a\\nb'.replace('\\\\',+'\\')|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|687984|或|unstyled|687985|'a\nb'.replace('\n',+'\\n')|687986|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>r'a\\nb'.replace('\\\\', '\\')
</code></pre>

or

<pre><code>'a\nb'.replace('\n', '\\n')
</code></pre>

blocks|key|710327|text|您的原始字符串，a+=+'a\\nb'实际上没有两个'\'字符，第一个是对后者的转义。如果您这样做了，print+a，您将看到实际上只有一个'\'字符。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|710328|>>>+a+=+'a\\nb'
>>>+print+a
a\nb|code-block|syntax|javascript|710329|但是，如果您的意思是将'\n'解释为换行符，而不转义斜杠，那么：|710330|>>>+b+=+a.replace('\\n',+'\n')
>>>+b
'a\nb'
>>>+print+b
a
b|710331|entityMap^0|8|B|Q|3|1F|7|1Y|3|0|0|B|4|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|P|$]]

Your original string, <code>a = 'a\\nb'</code> does not actually have two <code>'\'</code> characters, the first one is an escape for the latter. If you do, <code>print a</code>, you'll see that you actually have only one <code>'\'</code> character.

<pre><code>&gt;&gt;&gt; a = 'a\\nb'
&gt;&gt;&gt; print a
a\nb
</code></pre>

If, however, what you mean is to interpret the <code>'\n'</code> as a newline character, without escaping the slash, then:

<pre><code>&gt;&gt;&gt; b = a.replace('\\n', '\n')
&gt;&gt;&gt; b
'a\nb'
&gt;&gt;&gt; print b
a
b
</code></pre>

blocks|key|710339|text|没有必要对此使用替换。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710340|您所拥有的是一个编码字符串(使用string_escape编码)，您希望对它进行解码：|offset|length|style|CODE|710341|>>>+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'|code-block|syntax|javascript|710342|在Python+3中：|710343|>>>+import+codecs
>>>+codecs.decode('\\n\\x21',+'unicode_escape')
'\n!'|710344|entityMap^0|0|G|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

There's no need to use replace for this. 

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

<pre><code>&gt;&gt;&gt; s = r"Escaped\nNewline"
&gt;&gt;&gt; print s
Escaped\nNewline
&gt;&gt;&gt; s.decode('string_escape')
'Escaped\nNewline'
&gt;&gt;&gt; print s.decode('string_escape')
Escaped
Newline
&gt;&gt;&gt; "a\\nb".decode('string_escape')
'a\nb'
</code></pre>

In Python 3:

<pre><code>&gt;&gt;&gt; import codecs
&gt;&gt;&gt; codecs.decode('\\n\\x21', 'unicode_escape')
'\n!'
</code></pre>

blocks|key|710346|text|path+=+"C:\\Users\\Programming\\Downloads"
#+Replace+\\+with+a+\+along+with+any+random+key+multiple+times
path.replace('\\',+'\pppyyyttthhhooonnn')
#+Now+replace+pppyyyttthhhooonnn+with+a+blank+string
path.replace("pppyyyttthhhooonnn",+"")

print(path)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|710347|输出..。C：\User\Programming\下载|unstyled|710348|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>path = &quot;C:\\Users\\Programming\\Downloads&quot;
# Replace \\ with a \ along with any random key multiple times
path.replace('\\', '\pppyyyttthhhooonnn')
# Now replace pppyyyttthhhooonnn with a blank string
path.replace(&quot;pppyyyttthhhooonnn&quot;, &quot;&quot;)

print(path)
</code></pre>
#Output...
C:\Users\Programming\Downloads

blocks|key|688031|text|在Python+3中，它将是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|688032|bytes(s,+'utf-8').decode("unicode_escape")|code-block|syntax|javascript|688033|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Python 3 it will be:
<pre><code>bytes(s, 'utf-8').decode(&quot;unicode_escape&quot;)
</code></pre>

blocks|key|710382|text|这适用于Python+3.x的Windows：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710383|import+os
str(filepath).replace(os.path.sep,+'/')|code-block|syntax|javascript|710384|其中：os.path.sep在Windows上是\，在Linux上是/。|offset|length|style|CODE|710385|个案研究|710386|在生成Markdown文件并将其呈现给pdf时，可以使用它来防止错误。|710387|entityMap^0|0|0|3|B|O|1|Y|1|0|0|J|3|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]|$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@$I|13|J|14|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|R|$]]

This works on Windows with Python 3.x:
<pre><code>import os
str(filepath).replace(os.path.sep, '/')
</code></pre>
Where: <code>os.path.sep</code> is <code>\</code> on Windows and <code>/</code> on Linux.
<h2>Case study</h2>
Used this to prevent errors when generating a Markdown file then rendering it to <code>pdf</code>.

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

<pre><code>&gt;&gt;&gt; a
'a\\nb'
&gt;&gt;&gt; a.replace("\\","\")
 File "&lt;stdin&gt;", line 1
 a.replace("\\","\")
 ^
SyntaxError: EOL while scanning string literal
&gt;&gt;&gt; a.replace("\\",r"\")
 File "&lt;stdin&gt;", line 1
 a.replace("\\",r"\")
 ^
SyntaxError: EOL while scanning string literal
&gt;&gt;&gt; a.replace("\\",r"\\")
'a\\\\nb'
&gt;&gt;&gt; a.replace("\\","\\")
'a\\nb'
</code></pre>

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

<pre><code>&gt;&gt;&gt; a.replace("\\","%")
'a%nb'
</code></pre>

Is there something I'm missing here?

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

<pre><code>&gt;&gt;&gt; a = "a\\nb"
&gt;&gt;&gt; b = "a\nb"
&gt;&gt;&gt; print a
a\nb
&gt;&gt;&gt; print b
a
b
&gt;&gt;&gt; a.replace("\\","\\")
'a\\nb'
&gt;&gt;&gt; a.replace("\\\\","\\")
'a\\nb'
</code></pre>

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

Python Replace \\ with \

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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所以我似乎想不出.我有一个字符串说，"a\\nb"和我想把它变成"a\nb"。我试过以下所有的方法，但似乎没有一种有效；>>> a'a\\nb'>>> a.replace("\\","\") File "<stdin>", line 1 a.replace("\\","\") ...

问Python将\\替换为\
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问Python将\\替换为\EN