How to create raw string from string variable in python?

Question

You create raw string from a string this way:

test_file=open(r\'c:\\Python27\\test.txt\',\'r\')

How do you create a raw variable from a str

Answer 1

My solution to convert string to raw string (works with this sequences only: '\a', \b', '\f', '\n', '\r', '\t', '\v' . List of all escape sequences is here):

def str_to_raw(s):
    raw_map = {8:r'\b', 7:r'\a', 12:r'\f', 10:r'\n', 13:r'\r', 9:r'\t', 11:r'\v'}
    return r''.join(i if ord(i) > 32 else raw_map.get(ord(i), i) for i in s)

Demo:

>>> file_path = "C:\Users\b_zz\Desktop\fy_file"
>>> file_path
'C:\\Users\x08_zz\\Desktop\x0cy_file'
>>> str_to_raw(file_path)
'C:\\Users\\b_zz\\Desktop\\fy_file'