Convert Regular Python String to Raw String

Make Python string a raw string

The idea behind r' ' is to write raw string literals, because it changes the way python escape characters. If it happens to be a value from a variable, as you stated above, you don't need to use r' ' because you are not explicitly writing a string literal.

Either way, I think this will do:

path = r'%s' % pathToFile

EDIT:
Also, as commented to the question, you should really be sure the path exists.

casting raw strings python

Python 3:

"hurr..\n..durr".encode('unicode-escape').decode()

Python 2:

"hurr..\n..durr".encode('string-escape')

Converting string to raw string for json processing [Python]

You're going the wrong direction here, if you want to create JSON. You want dumps, not loads':

def createJsonText(txt):
    x = {'text': txt}
    y = json.dumps(x)
    open('tone.json','w').write(y)

Your code had mode='a' for append, but a set of separate JSON lines is NOT a valid JSON file. If you want it to be a valid JSON file, you need the whole file to be one document.

Update

Alternatively:

def createJsonText(txt):
    json.dump({'text':txt}, open('tone.json','w'))

How to create raw string from string variable in python?

There is no such thing as "raw string" once the string is created in the process. The "" and r"" ways of specifying the string exist only in the source code itself.

That means "\x01" will create a string consisting of one byte 0x01, but r"\x01" will create a string consisting of 4 bytes '0x5c', '0x78', '0x30', '0x31'. (assuming we're talking about python 2 and ignoring encodings for a while).

You mentioned in the comment that you're taking the string from the user (either gui or console input will work the same here) - in that case string character escapes will not be processed, so there's nothing you have to do about it. You can check it easily like this (or whatever the windows equivalent is, I only speak *nix):

% cat > test <<EOF                                             
heredoc> \x41
heredoc> EOF
% < test python -c "import sys; print sys.stdin.read()"
\x41

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