[Python-modules-team] Bug#960537: Bug#960537: Bug#960537: python3-html5lib: DeprecationWarning in collections import (will be failure with python3.9)

[Scott Kitterman]

On Wednesday, May 13, 2020 2:45:48 PM EDT Scott Kitterman wrote:
> On Wednesday, May 13, 2020 1:14:54 PM EDT Scott Kitterman wrote:
> > Package: python3-html5lib
> > Version: 1.0.1-3
> > Severity: normal
> > 
> > Currently with python3.7 or 3.8:
> > DeprecationWarning: Using or importing the ABCs from 'collections' instead
> > of from 'collections.abc' is deprecated, and in 3.9 it will stop working
> > from collections import Mapping
> > 
> > When we get python3.9 it'll be:
> > 
> > Python 3.9.0a2+ (heads/master:b0d4949, Dec 20 2019, 11:38:30)
> > [GCC 8.3.0] on linux
> > Type "help", "copyright", "credits" or "license" for more information.
> > 
> > >>> import html5lib
> > 
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in <module>
> >   File
> > 
> > "/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/site-packages/html5lib/__i
> > n
> > it__.py", line 25, in <module> from .html5parser import HTMLParser, parse,
> > parseFragment
> > 
> >   File
> > 
> > "/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/site-packages/html5lib/htm
> > l
> > 5parser.py", line 8, in <module> from . import _tokenizer
> > 
> >   File
> > 
> > "/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/site-packages/html5lib/_to
> > k
> > enizer.py", line 16, in <module> from ._trie import Trie
> > 
> >   File
> > 
> > "/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/site-packages/html5lib/_tr
> > i
> > e/__init__.py", line 3, in <module> from .py import Trie as PyTrie
> > 
> >   File
> > 
> > "/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/site-packages/html5lib/_tr
> > i
> > e/py.py", line 6, in <module> from ._base import Trie as ABCTrie
> > 
> >   File
> > 
> > "/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/site-packages/html5lib/_tr
> > i
> > e/_base.py", line 3, in <module> from collections import Mapping
> > ImportError: cannot import name 'Mapping' from 'collections'
> > (/home/pi/.pyenv/versions/3.9-dev/lib/python3.9/collections/__init__.py)
> > 
> > I noticed this because python-bleach is looking into updating their
> > vendored copy (we don't use it) [1].  This change has been in html5lib
> > for some time [2], but with no release coming, I think we should fix it in
> > Debian.
> 
> It looks like there is also:
> 
> src/pip/_vendor/html5lib/treebuilders/dom.py:    from collections import
> MutableMapping
> 
> which will be a problem.
> 
> Scott K

Here's the patch that pip is carrying in their vendor tree, which looks right 
to me:

https://github.com/pypa/pip/blob/master/tools/automation/vendoring/patches/
html5lib.patch

Scott K
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