replace all "\" with "\\" python

Does anyone know how replace all \ with \\ in python? Ive tried:

re.sub('\','\\',string)

But it screws it up because of the escape seq开发者_运维知识库uence. does anyone know the awnser to my question?

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You just need to escape the backslashes in your strings: (also there's no need for regex stuff)

>>> s = "cats \\ dogs"
>>> print s
cats \ dogs
>>> print s.replace("\\", "\\\\")
cats \\ dogs

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you should do:

re.sub(r'\\', r'\\\\', string)

As r'\' is not a valid string

BTW, you should always use raw (r'') strings with regex as many things are done with backslashes.

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You should escape backslashes, and also you don't need regex for this simple operation:

>>> my_string = r"asd\asd\asd\\"
>>> print(my_string)
asd\asd\asd\\
>>> replaced = my_string.replace("\\", "\\\\")
>>> print(replaced)
asd\\asd\\asd\\\\

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You either need re.sub("\\\\","\\\\\\\\",string) or re.sub(r'\\', r'\\\\', string) because you need to escape each slash twice ... once for the string and once for the regex.

>>> whatever = r'z\w\r'
>>> print whatever
z\w\r
>>> print re.sub(r"\\",r"\\\\", whatever)
z\\w\\r
>> print re.sub("\\\\","\\\\\\\\",whatever)
z\\w\\r