of the data it has downloaded, and just returns it. In this case you just have
to assume that the download was successful.
-
-.. data:: _urlopener
-
- The public functions :func:`urlopen` and :func:`urlretrieve` create an instance
- of the :class:`FancyURLopener` class and use it to perform their requested
- actions. To override this functionality, programmers can create a subclass of
- :class:`URLopener` or :class:`FancyURLopener`, then assign an instance of that
- class to the ``urllib.request._urlopener`` variable before calling the
- desired function. For example, applications may want to specify a different
- :mailheader:`User-Agent` header than :class:`URLopener` defines.
- This can be accomplished with the following code::
-
- import urllib.request
-
- class AppURLopener(urllib.request.FancyURLopener):
- version = "App/1.7"
-
- urllib.request._urlopener = AppURLopener()
-
-
.. function:: urlcleanup()
Clear the cache that may have been built up by previous calls to