php function "addslashes" / "removeslashes" in python

[Fredrik Lundh]

Lowel Stern wrote:

> Does anyone know if this exists already?

if you're doing database, you really should learn to use bound
parameters...

but if you insist, this might be a pretty good approximation:

import re

def addslashes(string, sub=re.compile(r"[\\\"']").sub):
    def fixup(m):
        return "\\" + m.group(0)
    return sub(fixup, string)

def removeslashes(string, sub=re.compile(r"(?s)\\(.)|\\").sub):
    def fixup(m):
        ch = m.group(1)
        if ch is None:
            raise 'Parse Error: backslash at end of string'
        if ch not in r"\\\"'":
            raise 'Parse Error: unsupported character after backslash'
        return ch
    return sub(fixup, string)

</F>