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Since Matplotlib 1.5.1, I see a warning (twice) each time I instantiate a FontManager():
In [2]: from matplotlib.font_manager import FontManager
In [3]: FontManager()
/Users/tom/miniconda3/envs/production/lib/python3.4/site-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
/Users/tom/miniconda3/envs/production/lib/python3.4/site-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
Out[3]: <matplotlib.font_manager.FontManager at 0x1057b6630>
In [4]: FontManager()
/Users/tom/miniconda3/envs/production/lib/python3.4/site-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
/Users/tom/miniconda3/envs/production/lib/python3.4/site-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
Out[4]: <matplotlib.font_manager.FontManager at 0x1064d4ba8>This did not happen with 1.5.0. There's two issues here - the warning is repeated twice at each call, which indicates that the command is being run twice (inefficient), and the warning is being shown at all - why does fc-list need to be run every time FontManager is run? Even if there is a good reason for it to run, I'm not sure if a warning is necessary?
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