Trim padding on string

trim_padding.py

import re

def remove_padding(char, s, left=None, right=None):
    if not left and not right:
        print("You must specify either left or right.")
        return
    elif left:
        return re.findall(re.escape(char) + r"*(.+)", s)[0]
    elif right:
        return re.findall(re.escape(char) + r"*(.+)", s[::-1])[0][::-1]

s = "123000000"
s_trimmed = remove_padding("0", s, right=True)
print(s_trimmed)