Python: Capitalize First Letter of Each Word in a String (including after punctuation)

title_extended.py

import re
import string


def lowercase_match_group(matchobj):
    return matchobj.group().lower()


# Make titles human friendly
# http://daviseford.com/python-string-to-title-including-punctuation
def title_extended(title):
    if title is not None:
        # Take advantage of title(), we'll fix the apostrophe issue afterwards
        title = title.title()

        # Special handling for contractions
        poss_regex = r"(?<=[a-z])[\']([A-Z])"
        title = re.sub(poss_regex, lowercase_match_group, title)

    return title

def title_one_liner(title):
    return re.sub(r"(?<=[a-z])[\']([A-Z])", lambda x: x.group().lower(), title.title())

str = "my dog's bone/toy has 'fleas' -yikes!"
assert title_extended(str) == "My Dog's Bone/Toy Has 'Fleas' -Yikes!"

# Note the errors that would occur with native implementations
assert str.title() == "My Dog'S Bone/Toy Has 'Fleas' -Yikes!"
assert string.capwords(str) == "My Dog's Bone/toy Has 'fleas' -yikes!"