urllib.unquote

As an AI language model, I don't have access to the latest implementation details. However, the `urllib.unquote` function was used in Python 2 to decode percent-encoded characters in a URL string. It is part of the `urllib` module, which is used for handling URLs in Python.

Here's an example usage:

import urllib

url = 'https://www.example.com/search?q=hello%20world'
decoded_url = urllib.unquote(url)

print(decoded_url)  # https://www.example.com/search?q=hello world

In this example, the `%20` in the search query parameter is decoded to a space character (` `) using `urllib.unquote()`.