Re: reducing matplotlib2 build-depends.
By itself, removing those dependencies reduces the big tangle [0] from
148 packages to 141, the freed ones being: ipywidgets pyqt5 pep8
autopep8 xcffib xlwt cairocffi. (Note that "not in a tangle" means "no
*circular* dependencies", *not* "leaf / can be removed immediately".)
There may also be more packages that have more than one link into the
tangle but could have all of those links cut.
This was calculated from the Blocks of py2removal bugs, so only
considers packages that still have an open py2removal bug, not
already-removed packages e.g. pandas.
[0] Largest strongly connected component: can't remove any subset
(except all or none) without breaking at least some of the remaining
ones. Previously discussed in
https://lists.debian.org/debian-python/2019/10/threads.html#00092
The full 148 are: alabaster apipkg automat autopep8
backports.functools-lru-cache beautifulsoup4 cairocffi chardet
colorspacious configobj contextlib2 cython dbus-python dot2tex
entrypoints enum34 execnet fdb freezegun html5lib incremental ipykernel
ipython ipython-genutils ipywidgets jupyter-client jupyter-core
keyrings.alt lxml mako matplotlib matplotlib2 mayavi2 mercurial
more-itertools mpmath nose numexpr numpydoc pep8 pexpect pickleshare
pillow pycairo pyflakes pyglet pygments pygobject pygobject-2 pygtk
pyhamcrest pymacs pyopenssl pyqt5 pyrex pytables pytest pytest-expect
pytest-forked pytest-runner pytest-xdist python-apptools python-apt
python-atomicwrites python-attrs python-babel python-cffi python-chaco
python-changelog python-characteristic python-click python-cryptography
python-cycler python-dateutil python-debian python-docutils
python-enable python-envisage python-flake8 python-flaky python-funcsigs
python-future python-genty python-gevent python-greenlet
python-hypothesis python-importlib-metadata python-iso8601
python-keyring python-linecache2 python-mccabe python-mock python-mode
python-numpy python-packaging python-pathlib2 python-pbr python-pip
python-pluggy python-psutil python-py python-pyface python-pysqlite2
python-qt4 python-scipy python-secretstorage python-service-identity
python-setupdocs python-traceback2 python-traits python-traitsui
python-typing python-tz python-urllib3 python-virtualenv
python-webencodings python-whoosh python-zipp pyxdg pyyaml pyzmq
requests rope ropemacs ropemode setuptools-scm sip4 six soupsieve sphinx
sphinx-gallery sphinx-paramlinks sphinx-rtd-theme
sphinxcontrib-websupport sqlalchemy sympy tap.py testresources
texlive-base texlive-extra traitlets twisted unittest2 wcwidth wheel
xapian-bindings xcffib xlwt
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