(mat_bug_py37) moonbase:~ lloyd$ ls -al /Users/lloyd/.matplotlib/fontlist-v300.json
-rw-r--r--  1 lloyd  staff  130027 Sep 19 10:45 /Users/lloyd/.matplotlib/fontlist-v300.json
(mat_bug_py37) moonbase:~ lloyd$ python -c 'from matplotlib import pyplot'
(mat_bug_py37) moonbase:~ lloyd$ rm  /Users/lloyd/.matplotlib/fontlist-v300.json
(mat_bug_py37) moonbase:~ lloyd$ python -c 'from matplotlib import pyplot'

^CTraceback (most recent call last):
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 1353, in <module>
    fontManager = json_load(_fmcache)
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 888, in json_load
    with open(filename, 'r') as fh:
FileNotFoundError: [Errno 2] No such file or directory: '/Users/lloyd/.matplotlib/fontlist-v300.json'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/pyplot.py", line 32, in <module>
    import matplotlib.colorbar
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/colorbar.py", line 32, in <module>
    import matplotlib.contour as contour
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/contour.py", line 18, in <module>
    import matplotlib.font_manager as font_manager
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 1363, in <module>
    _rebuild()
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 1344, in _rebuild
    fontManager = FontManager()
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 978, in __init__
    ttffiles = findSystemFonts(paths) + findSystemFonts()
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 270, in findSystemFonts
    fontfiles.update(OSXInstalledFonts(fontext=fontext))
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 218, in OSXInstalledFonts
    for directory in directories
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 220, in <listcomp>
    for path in list_fonts(directory, ext)]
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 157, in list_fonts
    for path in filter(Path.is_file, Path(directory).glob("**/*.*"))
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/site-packages/matplotlib/font_manager.py", line 156, in <listcomp>
    return [str(path)
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/pathlib.py", line 1344, in is_file
    return S_ISREG(self.stat().st_mode)
  File "/Users/lloyd/anaconda2/envs/mat_bug_py37/lib/python3.7/pathlib.py", line 1140, in stat
    return self._accessor.stat(self)
KeyboardInterrupt
^C