Python replacing all uppercase characters in a string with *

Question

Is there a simple, straightforward way to turn this string:

"aBCd3Fg"

Into:

"a**d3*g"

In python 2.7?

Answer 1

Not sure how fast you need this, but if you're looking for the fastest solution out there. The python string module's translate function is a slightly more roundabout, though generally more performant method:

import string

transtab = string.maketrans(string.uppercase, '*'*len(string.uppercase))
"aBCd3Fg".translate(transtab)

>>>'a**d3*g'

I'm always surprised about how many people don't know about this trick. One of the best guarded secrets in python IMO

Answer 2

import re

print re.sub(r'[A-Z]', '*', "aBCd3Fg")