I just created a new conda environment with Matplotlib included, and it duly 
installed matplotlib: 2.0.0-np111py27_0. It installed PyQt5 by default, whereas 
I need PyQt4, but when I installed PyQt4 (conda install pyqt=4), it 
automatically downgraded Matplotlib to 1.5.1.
--------
The following packages will be DOWNGRADED due to dependency conflicts:

    matplotlib: 2.0.0-np111py27_0 --> 1.5.1-np111py27_0
    pyqt:       5.6.0-py27_2      --> 4.11.4-py27_4    
    qt:         5.6.2-0           --> 4.8.7-4
--------
Is PyQt5 really a dependency for Matplotlib v2? I have been testing release 
candidate versions of Matplotlib v2 without any problem. This will cause 
headaches to my users who want the latest features.

Ray
-- 
Ray Osborn, Senior Scientist
Materials Science Division
Argonne National Laboratory
Argonne, IL 60439, USA
Phone: +1 (630) 252-9011
Email: rosb...@anl.gov



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