增加python文档

web/python-docs/_sources/library/urllib.rst.txt

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+:mod:`urllib` --- URL handling modules
+======================================
+
+.. module:: urllib
+
+**Source code:** :source:`Lib/urllib/`
+
+--------------
+
+``urllib`` is a package that collects several modules for working with URLs:
+
+* :mod:`urllib.request` for opening and reading URLs
+* :mod:`urllib.error` containing the exceptions raised by :mod:`urllib.request`
+* :mod:`urllib.parse` for parsing URLs
+* :mod:`urllib.robotparser` for parsing ``robots.txt`` files