AttributeError: module 'pandas' has no attribute 'plotting' with tox

pandas 0.20.3 fails to import on every test when running tox.

• tox packages installed, besides my package:

cycler==0.10.0, matplotlib==2.0.2, numexpr==2.6.2, numpy==1.13.1, pandas==0.20.3, py==1.4.34, pyparsing==2.2.0, pytest==3.2.2, pytest-travis-fold==1.2.0, python-dateutil==2.6.1, pytz==2017.2, scipy==0.19.1, six==1.10.0, tables==3.4.2

• platform linux -- Python 3.5.2, pytest-3.2.2, py-1.4.34, pluggy-0.4.0

• all tests fail with the following error:

myfile.py:16: in <module>
    import pandas as pd
.tox/3.5-nocov/lib/python3.5/site-packages/pandas/__init__.py:51: in <module>
    plot_params = pandas.plotting._style._Options(deprecated=True)
E   AttributeError: module 'pandas' has no attribute 'plotting'

Testing the same import in a virtualenv without tox works correctly.

Looks like it is a problem with pandas, but could also be something regarding tox (or even pytest). Hopefully, someone more experienced with tox can guide me here.

Output of pd.show_versions()

Taken from the virtualenv I created to test outside tox.

INSTALLED VERSIONS

commit: None python: 3.6.2.final.0 python-bits: 64 OS: Linux OS-release: 4.4.0-93-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: pt_PT.UTF-8

pandas: 0.20.3 pytest: 3.2.2 pip: 9.0.1 setuptools: 28.8.0 Cython: None numpy: 1.13.1 scipy: 0.19.1 xarray: None IPython: None sphinx: 1.6.3 patsy: None dateutil: 2.6.1 pytz: 2017.2 blosc: None bottleneck: None tables: 3.4.2 numexpr: 2.6.2 feather: None matplotlib: 2.0.2 openpyxl: None xlrd: None xlwt: None xlsxwriter: None lxml: None bs4: None html5lib: None sqlalchemy: None pymysql: None psycopg2: None jinja2: 2.9.6 s3fs: None pandas_gbq: None pandas_datareader: None None

[TomAugspurger]

Ahh, yeah that issue has been an unanticipated headache of switching to pytest.

I think there was a workaround where you add the change in https://github.com/pandas-dev/pandas/pull/16797/files to your conftest.py and pytest won’t complain? Otherwise, the next release is in about 2 weeks, and things should work.

[cachitas]

Apologies for not being so concise, but I wanted to illustrate my tox.ini without omitting the potential source of the problem.

I already tested your example in my machine and it is working.

So my next step was to build up step by step from that until I get the error reported, and it looks it comes from pytest.

I have the following configuration in setup.cfg:

[tool:pytest]
norecursedirs =
	.git
	.tox
	.env
	dist
	build
python_files =
	test_*.py
	*_test.py
	tests.py
addopts =
	-rxEfsw
	--strict
	--ignore=docs/conf.py
	--ignore=setup.py
	--ignore=.eggs
	--doctest-modules
	--doctest-glob=\*.rst
	--tb=short

After a quick test I found that the --strict option is the root of all evil. This led me to #16852 and #16680. Apparently you have already tackled this issue. I just complicated it a lot more because I could not identify the problem immediately. Hopefully, this should be fixed in the next bugfix release.