Fixes bug: pylookup fails silently on 404. For instance, on
`./pylookup -u https://matplotlib.org/` it first looks up
'https://matplotlib.org/genindex-all.html', gets a 404 response,
but instead of moving to the next candidate url, it builds an empty
index.
Cause of bug: urllib.urlopen doesn't give an error on 404.
This fixes bug #9866.
Tested to work with documentation of Python 2.6, Python 2.7, Python 3.4,
Python 3.5, Python 3.6, and latest stable releases for SciPy, NumPy,
Matplotlib, and Flask.
Fix for bug: extraneous links registered for last entry
in index. For instance, for python documentation index,
all links in footer would get attached to `zlib`.
Doing it handle_data was a bug because `self.tag`
would contain the most recent opened tag, not the tag
currently being closed. This meant, for instance, that
the elements were not being generated correctly and
"./pylook.py --cache" was broken.
Helm seems to treat "!" specially in pattern matching, so having a ! in
the pattern string when traversing directories is problematic. This
change fixes#2737, because as far as I can tell "+" has no special
meaning in a helm pattern.
Of course, we can choose a different character, but I'm fond of "+" as
representing "more layers here".