urlib - to use or not to use ( for web scraping )?

[Larz60+]

that's cool but the condition to be met is that we know at first that utils exists...Is there any command such as dir that gives a list of all the methods? It looks that answer is negative.

Well, you don't unless someone tells you or you go digging.
You can start by looking at the documentation of top level packages.
For example if you look at requests by itself, you'll see

Output:
PACKAGE CONTENTS
    __version__
    _internal_utils
    adapters
    api
    auth
    certs
    compat
    cookies
    exceptions
    help
    hooks
    models
    packages
    sessions
    status_codes
    structures
    utils

Each of these has separate documents, and utils is listed here.

As a habit, when I'm not busy, I browse various packages to see what they contain. There's no way
to know what every one of them is and what it contains.
As of this minute, pypi contains 159,959 packages.