将转义的字符写入文件，以便字符可见 [英] write escaped character to file so that the character is visible

问题描述

我想将\t写入文件。不是制表符，而是字面上\t。
我该怎么做？一直把我疯狂了一个多小时，我尝试的一切都会产生一个实际的制表符（空格）。

为什么要这样？因为我正在使用ConfigParser（）生成一个配置文件，它也包含一些分隔符，而且我希望这个文件是可读的。我不认为空间可读。

编辑：对不起，问题不清楚：我想为包含字符串的变量做这个。所以写\\不是一个选项。我必须以意想不到的方式将含有转义字符的变量的值写入到文件中：

  v =\\ \\ t
写（v）
  

而不更改 v （虽然在 v 上的操作可以）
似乎不可能更改 v 在被定义为\t之后变为\\\t。

解决方案

以避免反斜杠，因此它不会被解释为特殊字符：

  file_handle.write（\\t ）
  

编辑：看起来你最好的选择是使用python的优秀的 string.replace（） function：

 >> > v =aaa \t bbb
>>>打印v 
 aaa bbb 
>>> x = v.replace（\t，\\）＃<  - 用'\\\''替换字符串中的所有'\'
>> >打印x 
 aaa \t bbb 
  

注意： v 将保持不变，因为字符串在python中是不可变的

编辑2：

看起来转换为原始字符串将会为您避免转义所有转义的字符：

 > >> a ='aaa\\\
bbb\\\
\tccc'
>>>>打印
 aaa 
 bbb 
 ccc 
>>> b = a.encode（'string-escape'）
>>>打印b 
 aaa\\\
bbb\\\
\tccc 
  

I want to write "\t" to a file. Not a "tab character", but literally "\t". How do I do this? It has been driving me crazy for more than an hour; everything I try produces an actual "tab character" (empty space).

Why would I want this? Because I'm generating a config file with a ConfigParser() which also includes some delimiters, and I want that file to be human-readable. I do not consider empty space readable.

EDIT: sorry, the problem was not clear: I want to do this for variables that contain strings. So writing "\\t" is not an option. I must write the value of a variable containing an escaped character to a file in a manner ideologically equivalent to:

v = "\t"
write(v)

without changing the definition of v (though operations on v are OK) It seems impossible to change v into "\\t" after it has been defined as "\t".

解决方案

You need to escape the backslash so it won't be interpreted as a special character:

file_handle.write("\\t")

EDIT: It looks like your best option will be to use python's excellent string.replace() function:

>>> v = "aaa \t bbb"
>>> print v
aaa      bbb
>>> x = v.replace("\t", "\\t")  # <-- replace all '\t' in string with '\\t'
>>> print x
aaa \t bbb

Note: v will be unchanged, since strings are immutable in python

EDIT 2:

Looks like converting to a raw string will take care of escapeing all escaped characters for you:

>>> a = 'aaa\nbbb\n\tccc'
>>> print a
aaa
bbb
        ccc
>>> b = a.encode('string-escape')
>>> print b
aaa\nbbb\n\tccc

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