matplotlib does not build on python 3.6 #8271
Description
On ubuntu 16.04, the following fails:
cd ~/Desktopgit clone https://github.com/ResidentMario/matplotlibsudo apt-get install python-matplotlibcd matplotlibconda create --name matplotlib-dev pytest numpy pytz libpng cycler six python=3.6source activate matplotlib-devpip install -v -e ./(ref)python tests.py
With:
!!!!!!!!!!!!!!!!!!! Interrupted: 58 errors during collection !!!!!!!!!!!!!!!!!!!
=========================== 58 error in 8.59 seconds ===========================
All of the form:
___________ ERROR collecting lib/mpl_toolkits/tests/test_mplot3d.py ____________
../../miniconda3/envs/matplotlib-dev/lib/python3.6/site-packages/_pytest/python.py:418: in _importtestmodule
mod = self.fspath.pyimport(ensuresyspath=importmode)
../../miniconda3/envs/matplotlib-dev/lib/python3.6/site-packages/py/_path/local.py:662: in pyimport
__import__(modname)
<frozen importlib._bootstrap>:961: in _find_and_load
???
<frozen importlib._bootstrap>:950: in _find_and_load_unlocked
???
<frozen importlib._bootstrap>:646: in _load_unlocked
???
<frozen importlib._bootstrap>:616: in _load_backward_compatible
???
../../miniconda3/envs/matplotlib-dev/lib/python3.6/site-packages/_pytest/assertion/rewrite.py:216: in load_module
py.builtin.exec_(co, mod.__dict__)
lib/mpl_toolkits/tests/test_mplot3d.py:3: in <module>
from mpl_toolkits.mplot3d import Axes3D, axes3d, proj3d, art3d
lib/mpl_toolkits/mplot3d/__init__.py:6: in <module>
from .axes3d import Axes3D
lib/mpl_toolkits/mplot3d/axes3d.py:21: in <module>
import matplotlib.axes as maxes
lib/matplotlib/axes/__init__.py:4: in <module>
from ._subplots import *
lib/matplotlib/axes/_subplots.py:10: in <module>
from matplotlib.axes._axes import Axes
lib/matplotlib/axes/_axes.py:26: in <module>
import matplotlib.dates as _ # <-registers a date unit converter
lib/matplotlib/dates.py:129: in <module>
import dateutil.parser
<frozen importlib._bootstrap>:961: in _find_and_load
???
<frozen importlib._bootstrap>:946: in _find_and_load_unlocked
???
<frozen importlib._bootstrap>:885: in _find_spec
???
<frozen importlib._bootstrap_external>:1157: in find_spec
???
<frozen importlib._bootstrap_external>:1131: in _get_spec
???
<frozen importlib._bootstrap_external>:1112: in _legacy_get_spec
???
<frozen importlib._bootstrap>:427: in spec_from_loader
???
<frozen importlib._bootstrap_external>:544: in spec_from_file_location
???
E File "/home/alex/miniconda3/envs/matplotlib-dev/lib/python3.6/site-packages/python_dateutil-2.6.0-py3.6.egg/dateutil/parser.py", line 50
E SyntaxError: invalid escape sequence \.
What conda list says:
# packages in environment at /home/alex/miniconda3/envs/matplotlib-dev:
#
blas 1.1 openblas conda-forge
ca-certificates 2017.1.23 0 conda-forge
certifi 2017.1.23 py36_0 conda-forge
cycler 0.10.0 py36_0 conda-forge
libgfortran 3.0.0 1
libpng 1.6.28 0 conda-forge
ncurses 5.9 10 conda-forge
numpy 1.12.0 py36_blas_openblas_200 [blas_openblas] conda-forge
openblas 0.2.19 1 conda-forge
openssl 1.0.2h 3 conda-forge
pip 9.0.1 py36_0 conda-forge
py 1.4.32 py36_0 conda-forge
pytest 3.0.6 py36_0 conda-forge
python 3.6.0 2 conda-forge
pytz 2016.10 py36_0 conda-forge
readline 6.2 0 conda-forge
setuptools 33.1.0 py36_0 conda-forge
six 1.10.0 py36_1 conda-forge
sqlite 3.13.0 1 conda-forge
tk 8.5.19 1 conda-forge
wheel 0.29.0 py36_0 conda-forge
xz 5.2.2 0 conda-forge
zlib 1.2.11 0 conda-forge
This is a python 3.6 failure. If in step six you instead do: conda create --name matplotlib-dev pytest numpy pytz libpng cycler six python=3.5, the build succeeds and all tests pass.