flake8 testing of https://github.com/matplotlib/matplotlib on Python 3.6.3
$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
./lib/matplotlib/backends/backend_pgf.py:144:20: F821 undefined name 'system_fonts' elif family in system_fonts and rcParams["pgf.texsystem"] != "pdflatex": ^ 1 F821 undefined name 'system_fonts' 1
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