Best way to replace multiple characters in a string?

Question

I need to replace some characters as follows: & ➔ \\&, # ➔ \\#, ...

I coded as follows, but I guess there

Answer 1

Are you always going to prepend a backslash? If so, try

import re
rx = re.compile('([&#])')
#                  ^^ fill in the characters here.
strs = rx.sub('\\\\\\1', strs)

It may not be the most efficient method but I think it is the easiest.