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⚡️ Speed up method FontManager._expand_aliases by 5% #221

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⚡️ Speed up method FontManager._expand_aliases by 5% #221

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17 changes: 12 additions & 5 deletions lib/matplotlib/font_manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,7 @@

# OS Font paths
try:
_HOME = Path.home()
_HOME = Path(os.devnull)
except Exception: # Exceptions thrown by home() are not specified...
_HOME = Path(os.devnull) # Just an arbitrary path with no children.
MSFolders = \
Expand Down Expand Up @@ -1039,8 +1039,12 @@ def __init__(self, size=None, weight='normal'):
timer.start()
try:
for fontext in ["afm", "ttf"]:
for path in [*findSystemFonts(paths, fontext=fontext),
*findSystemFonts(fontext=fontext)]:
found_fonts = set()
# collect fonts from explicit paths first
found_fonts.update(findSystemFonts(paths, fontext=fontext))
# collect system-wide fonts (avoiding duplicates)
found_fonts.update(findSystemFonts(fontext=fontext))
for path in found_fonts:
try:
self.addfont(path)
except OSError as exc:
Expand Down Expand Up @@ -1108,9 +1112,12 @@ def set_default_weight(self, weight):

@staticmethod
def _expand_aliases(family):
if family in ('sans', 'sans serif'):
# Optimization: localize frequently used values
rcParams = mpl.rcParams
if family == 'sans' or family == 'sans serif':
# Avoid creating a tuple and using the in operator, since there are only two values
family = 'sans-serif'
return mpl.rcParams['font.' + family]
return rcParams['font.' + family]

# Each of the scoring functions below should return a value between
# 0.0 (perfect match) and 1.0 (terrible match)
Expand Down