Hi Michael,
I was playing with python directly, so:
$ python
Python 2.7.2 (default, Mar 10 2012, 02:39:52)
[GCC 4.5.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
from matplotlib import font_manager
font_manager.path
'/home/mmokrejs/.fonts'
font_manager.rcParams
{'axes.formatter.use_locale': False, 'figure.subplot.right': 0.9, 'mathtext.cal': 'cursive', 'font.fantasy': ['Comic Sans MS', 'Chicago', 'Charcoal', 'ImpactWestern', 'fantasy'], 'xtick.minor.pad': 4, 'tk.pythoninspect': False, 'image.aspect': 'equal', 'font.cursive': ['Apple Chancery', 'Textile', 'Zapf Chancery', 'Sand', 'cursive'], 'figure.subplot.hspace': 0.2, 'keymap.fullscreen': 'f', 'examples.directory': '/usr/share/doc/matplotlib-1.1.0/examples', 'xtick.direction': 'in', 'axes.facecolor': 'w', 'mathtext.fontset': 'cm', 'ytick.direction': 'in', 'keymap.pan': 'p', 'path.snap': True, 'axes.axisbelow': False, 'lines.markersize': 6, 'figure.dpi': 80, 'text.usetex': False, 'image.origin': 'upper', 'patch.edgecolor': 'k', 'legend.labelspacing': 0.5, 'ps.useafm': False, 'mathtext.bf': 'serif:bold', 'lines.solid_joinstyle': 'round', 'font.monospace': ['Bitstream Vera Sans Mono', 'DejaVu Sans Mono', 'Andale Mono', 'Nimbus Mono L', 'Courier New', 'Courier', 'Fixed', 'Terminal', 'monospace
'], 'xtick.minor.size': 2, 'axes.formatter.limits': [-7, 7], 'figure.subplot.wspace': 0.2, 'savefig.edgecolor': 'w', 'image.cmap': 'jet', 'lines.marker': 'None', 'tk.window_focus': False, 'backend.qt4': 'PyQt4', 'font.serif': ['Bitstream Vera Serif', 'DejaVu Serif', 'New Century Schoolbook', 'Century Schoolbook L', 'Utopia', 'ITC Bookman', 'Bookman', 'Nimbus Roman No9 L', 'Times New Roman', 'Times', 'Palatino', 'Charter', 'serif'], 'savefig.facecolor': 'w', 'ytick.minor.size': 2, 'font.stretch': 'normal', 'text.dvipnghack': None, 'ytick.color': 'k', 'svg.fonttype': 'path', 'lines.linestyle': '-', 'xtick.color': 'k', 'xtick.major.pad': 4, 'patch.facecolor': 'b', 'figure.figsize': [8.0, 6.0], 'axes.linewidth': 1.0, 'keymap.zoom': 'o', 'legend.handletextpad': 0.8, 'mathtext.fallback_to_cm': True, 'lines.linewidth': 1.0, 'savefig.dpi': 100, 'verbose.fileo': 'sys.stdout', 'svg.image_noscale': False, 'docstring.hardcopy': False, 'font.size': 12, 'ps.fonttype': 3, 'path.simplify': True, 'key
map.all_axes': 'a', 'polaraxes.grid': True, 'text.hinting': True, 'pdf.compression': 6, 'grid.linewidth': 0.5, 'legend.frameon': True, 'figure.autolayout': False, 'figure.facecolor': '0.75', 'ps.usedistiller': False, 'legend.isaxes': True, 'figure.edgecolor': 'w', 'mathtext.tt': 'monospace', 'contour.negative_linestyle': 'dashed', 'image.interpolation': 'bilinear', 'lines.markeredgewidth': 0.5, 'keymap.home': ['h', 'r', 'home'], 'axes3d.grid': True, 'axes.edgecolor': 'k', 'legend.shadow': False, 'axes.titlesize': 'large', 'backend': 'GTKAgg', 'xtick.major.size': 4, 'keymap.xscale': ['k', 'L'], 'legend.fontsize': 'large', 'lines.solid_capstyle': 'projecting', 'mathtext.it': 'serif:italic', 'keymap.save': 's', 'font.variant': 'normal', 'toolbar': 'toolbar2', 'xtick.labelsize': 'medium', 'axes.unicode_minus': True, 'ps.distiller.res': 6000, 'axes.labelweight': 'normal', 'pdf.fonttype': 3, 'patch.linewidth': 1.0, 'pdf.inheritcolor': False, 'axes.color_cycle': ['b', 'g', 'r', 'c', 'm', 'y'
, 'k'], 'lines.dash_capstyle': 'butt', 'lines.color': 'b', 'figure.subplot.top': 0.9, 'pdf.use14corefonts': False, 'legend.markerscale': 1.0, 'patch.antialiased': True, 'font.style': 'normal', 'keymap.forward': ['right', 'v'], 'backend_fallback': True, 'legend.fancybox': False, 'grid.linestyle': ':', 'savefig.extension': 'auto', 'text.color': 'k', 'mathtext.rm': 'serif', 'legend.loc': 'upper right', 'interactive': False, 'cairo.format': 'png', 'savefig.orientation': 'portrait', 'svg.image_inline': True, 'ytick.major.size': 4, 'axes.grid': False, 'plugins.directory': '.matplotlib_plugins', 'grid.color': 'k', 'timezone': 'UTC', 'ytick.major.pad': 4, 'legend.borderpad': 0.4, 'examples.download': False, 'lines.dash_joinstyle': 'round', 'datapath': '/usr/share/matplotlib/mpl-data', 'lines.antialiased': True, 'text.latex.unicode': False, 'legend.handleheight': 0.7, 'image.lut': 256, 'figure.subplot.bottom': 0.1, 'text.latex.preamble': [''], 'legend.numpoints': 2, 'legend.handlelength': 2.0,
'keymap.grid': 'g', 'font.sans-serif': ['Bitstream Vera Sans', 'DejaVu Sans', 'Lucida Grande', 'Verdana', 'Geneva', 'Lucid', 'Arial', 'Helvetica', 'Avant Garde', 'sans-serif'], 'axes.labelcolor': 'k', 'font.family': 'sans-serif', 'axes.labelsize': 'medium', 'ytick.minor.pad': 4, 'legend.borderaxespad': 0.5, 'mathtext.sf': 'sans\\-serif', 'axes.hold': True, 'verbose.level': 'silent', 'mathtext.default': 'it', 'figure.subplot.left': 0.125, 'legend.columnspacing': 2.0, 'text.latex.preview': False, 'font.weight': 'normal', 'keymap.yscale': 'l', 'image.resample': False, 'agg.path.chunksize': 0, 'path.simplify_threshold': 0.1111111111111111, 'ytick.labelsize': 'medium', 'ps.papersize': 'letter', 'svg.embed_char_paths': True, 'keymap.back': ['left', 'c', 'backspace']}
font_manager.findfont('cmb10')
/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/share/fonts/mathematica-fonts/Vera.ttf'
font_manager.findfont('Utopia')
/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py:1216: UserWarning: findfont: Font family ['Utopia'] not found. Falling back to Bitstream Vera Sans
(prop.get_family(), self.defaultFamily[fontext]))
'/usr/share/fonts/mathematica-fonts/Vera.ttf'
font_manager.findfont('monospace')
'/usr/share/fonts/mathematica-fonts/VeraMono.ttf'
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'
[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.values() if str(x).startswith('cm')]
['cm']
[x for x in font_manager.rcParams.items() if x[1]=='cm']
[('mathtext.fontset', 'cm')]
[x for x in font_manager.rcParams.items() if x[1]=='10']
[x for x in font_manager.rcParams.items() if x[1]=='bold']
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'
Michael Droettboom wrote:
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? 
I've never seen this happen before. Are you setting "mathtext.sf" in a
matplotlibrc file or in Python code? Can you provide either so I can
see if I can reproduce the problem here?
See above. In python. I just wondered whether it was typo or escaping. Still think
it should be hidden to the user.
Isn't the escaping a cause for the seemingly missing fonts, like reported here?
[Matplotlib-users] need help with Times New Roman font.
No -- that appears to be caused by either using the wrong font name or
having an outdated font cache.
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'?
These are hardcoded in the mathtext engine and used when
`mathtext.fontset` is set to `cm`.
So my case (defaults).
Have you tried deleting your font cache? (~/.matplotlib/fontList.cache)
Ah, thanks for the full PATH, I couldn't find it. Yes, removing the file helped
me as well to get rid of the UserWarning message.
Martin
···
On 03/26/2012 04:36 PM, Martin Mokrejs wrote: