Hi,
I wondered why the matplotlib.font_manager.rcParams contains sometimes
escaped minus signs in font names:
>>> font_manager.rcParams['mathtext.sf']
'sans\\-serif'
>>>
>>> font_manager.findfont('sans-serif')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line
1327, in findfont
font = fontManager.findfont(prop, **kw)
File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line
1172, in findfont
prop = FontProperties(prop)
File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line
673, in __init__
self.set_fontconfig_pattern(family)
File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line
893, in set_fontconfig_pattern
for key, val in self._parse_fontconfig_pattern(pattern).items():
File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line
685, in _parse_fontconfig_pattern
return parse_fontconfig_pattern(pattern)
File "/usr/lib64/python2.7/site-packages/matplotlib/fontconfig_pattern.py",
line 127, in parse
raise ValueError("Could not parse font string: '%s'\n%s" % (pattern, e))
ValueError: Could not parse font string: 'sans-serif'
Expected end of text (at char 4), (line:1, col:5)
>>> font_manager.findfont('sans\\-serif')
'/usr/share/fonts/mathematica-fonts/Vera.ttf'
>>>
And there is nothing to read in the help string for this function, definitely
a place where the escaping should be explained.
>>> help(font_manager.findfont)
>>>
Anyway, I think the requirement for the escaping should be removed, it should be
escaped internally in the routine. So why is it so? For historic reasons? ;-)
Isn't the escaping a cause for the seemingly missing fonts, like reported here?
http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg22860.html
I am also getting:
/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1216:
UserWarning: findfont: Font family ['cmb10'] not found. Falling back to
Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1216:
UserWarning: findfont: Font family ['cmtt10'] not found. Falling back to
Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1216:
UserWarning: findfont: Font family ['cmss10'] not found. Falling back to
Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
The font to be used is assembled from several fields in the rcParams. I guess
from:
>>> [x for x in font_manager.rcParams.keys() if x.startswith('font')]
['font.cursive', 'font.family', 'font.fantasy', 'font.monospace',
'font.sans-serif', 'font.serif', 'font.size', 'font.stretch', 'font.style',
'font.variant', 'font.weight']
>>> [x for x in font_manager.rcParams.values() if x.startswith('cm')]
/usr/lib64/python2.7/site-packages/matplotlib/__init__.py:658: UserWarning:
svg.embed_char_paths is deprecated and replaced with svg.fonttype; please use
the latter.
warnings.warn(self.msg_depr % (key, alt))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'int' object has no attribute 'startswith'
>>> [x for x in font_manager.rcParams.items() if x[1]=='cm']
[('mathtext.fontset', 'cm')]
>>>
What else is used to give out the 'cmb10', 'cmtt10' and 'cmss10'?
>>> font_manager.findfont('cmb10')
'/usr/share/fonts/mathematica-fonts/Vera.ttf'
>>> font_manager.findfont('cmtt10')
/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1216:
UserWarning: findfont: Font family ['cmtt10'] not found. Falling back to
Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
'/usr/share/fonts/mathematica-fonts/Vera.ttf'
>>> font_manager.findfont('cmss10')
/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1216:
UserWarning: findfont: Font family ['cmss10'] not found. Falling back to
Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
'/usr/share/fonts/mathematica-fonts/Vera.ttf'
>>>
Thanks,
Martin
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