Problem Overview: String Compression

compression.py

def compress(s):
    compressed_string =""
    length=0
    ch=re.findall(r"(\w)\1*", s)
    for z in ch:
        m=re.search(r'{}*'.format(z),  s)
        length = len(m.group(0))
        compressed_string ="{}{}{}".format(compressed_string,z,length)
        s =s[length:]
    return compressed_string.replace("1","")

assert compress("bbcceeee") == "b2c2e4"
assert compress("aaabbbcccaaa") == "a3b3c3a3"
assert compress("a") == "a"

import re

Using regular expression It will have minimum number of loop and no comparison statement.