str.title
Make the first letter of each word uppercase and the rest lowercase.
Python 3.13
str.title()Return value
A new string; the original is not changed.
Examples
Capitalizing each word
Python 3.13
print('hello world'.title())Hello World
Uppercase letter after an apostrophe
Python 3.13
print("they're here".title())They'Re Here
Details
Any run of letters counts as a word, so a letter after an apostrophe also becomes uppercase: "they're" turns into "They'Re".