Comment by ks2048

That is capitalize()

There's a note in the docs [0],

    Changed in version 3.8: The first character is now put into titlecase rather than uppercase. This means that characters like digraphs will only have their first letter capitalized, instead of the full character.

EDIT: As the other reply says, ".title()" is probably a better answer to your question. Warning as the docs show [1], this splits things on sequence of letters, not whitespace!

    >>> "they're bill's friends from the UK".title()

    "They'Re Bill'S Friends From The Uk"

It's `.title()`, but note that it doesn't follow language-specific semantic rules like not capitalizing "the" and "of".