Bug report

Bug summary

FontProperties has a__str__ that appears to be intended to allow roundtripping (see use ofget_fontconfig_pattern/parse_fontconfig_pattern), but afterfp = FontProperties(); one hasFontProperties(str(fp)) != fp.

Code for reproduction

frommatplotlib.font_managerimportFontProperties,findfontfrommatplotlibimportstyle;style.use("seaborn")fp=FontProperties()print(fp)print(findfont(fp))fp_str_roundtrip=FontProperties(str(fp))print(fp_str_roundtrip)print(findfont(fp_str_roundtrip))

(setting the style to (matplotlib's version of) seaborn has the side-effect of changing the default sans-serif font from dejavusans to arial, which leads to the difference in the result of findfont -- otherwise, the default sans-serif font is also dejavusans and both calls to findfont return it).

Actual outcome

:family=sans-serif:style=normal:variant=normal:weight=normal:stretch=normal:size=10.0/usr/share/fonts/TTF/arial.ttf:family=:style=normal:variant=normal:weight=normal:stretch=normal:size=10.0findfont: Font family [''] not found. Falling back to DejaVu Sans./home/antony/src/extern/matplotlib/lib/matplotlib/mpl-data/fonts/ttf/DejaVuSans.ttf

Expected outcome

Proper roundtripping.

Matplotlib version

• Operating system: linux
• Matplotlib version: master
• Matplotlib backend (print(matplotlib.get_backend())): any
• Python version: 37
• Jupyter version (if applicable):
• Other libraries: