Error importing MDAnalysis.tests.datafiles

[luponzo86]

Expected behavior

Succesfull import of module MDAnalysis.tests.datafiles after installing MDAnalysisTests via pip

Actual behavior

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-2f9c58525a71> in <module>()
----> 1 from MDAnalysis.tests.datafiles import PSF, DCD

/srv/home/lponzoni/anaconda3/envs/ifpe/lib/python3.7/site-packages/MDAnalysis/tests/datafiles.py in <module>()
     41 
     42 try:
---> 43     from MDAnalysisTests.datafiles import *
     44 except ImportError:
     45     print("*** ERROR ***")

/srv/home/lponzoni/anaconda3/envs/ifpe/lib/python3.7/site-packages/MDAnalysisTests/__init__.py in <module>()
    124 try:
    125     import matplotlib
--> 126     matplotlib.use('agg', warn=False)
    127 except ImportError:
    128     pass

TypeError: use() got an unexpected keyword argument 'warn'

Code to reproduce the behavior

from MDAnalysis.tests.datafiles import PSF, DCD

Current version of MDAnalysis

• Which version are you using? 1.0.0
• Which version of Python (python -V)? Python 3.7.8
• Which operating system? Linux

[RMeli]

Hi @luponzo86 , unfortunately this is a known issue ( #2938, #3041) and should be fixed in the next release. In the meantime you can use pin matolotlib to matplotlib<3.3 as explained in #2938.

[luponzo86]

Sounds good, thanks! Apologies for the duplicate issue