[Tutor] list all links with certain extension in an html file python

[Santosh Kumar]

I want to extract (no I don't want to download) all links that end in
a certain extension.

Suppose there is a webpage, and in the head of that webpage there are
4 different CSS files linked to external server. Let the head look
like this:

    <link rel="stylesheet" type="text/css" href="http://foo.bar/part1.css";>
    <link rel="stylesheet" type="text/css" href="http://foo.bar/part2.css";>
    <link rel="stylesheet" type="text/css" href="http://foo.bar/part3.css";>
    <link rel="stylesheet" type="text/css" href="http://foo.bar/part4.css";>

Please note that I don't want to download those CSS, instead I want
something like this (to stdout):

    http://foo.bar/part1.css
    http://foo.bar/part1.css
    http://foo.bar/part1.css
    http://foo.bar/part1.css

Also I don't want to use external libraries. I am asking for: which
libraries and functions should I use?
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