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Matplotlib Import fails after successive run of custom tool

Question asked by jstreufert on Aug 16, 2018
Latest reply on Jan 9, 2019 by silas.frantz

Hey all - I have a custom toolbox that imports Matplotlib and numpy to do some charting.  The tool will run perfect upon opening and on an initial run.  Each successive run in an open ArcMap session gives me the error: import matplotlib as plt KeyError: u'PolyCollection'


Any ideas or help is appreciated!