BUG: Setting ticksize xx-small broken by #17348

@QuLogic

On commit 9909aeb this code works fine:

import matplotlib.pyplot as plt
plt.rcParams['xtick.labelsize'] = 'xx-small'
fig, ax = plt.subplots()

After #17348 (specifically 222b3ba) I get:

Traceback

>>> Traceback (most recent call last):
  File "/home/larsoner/python/matplotlib/lib/matplotlib/fontconfig_pattern.py", line 127, in parse
    self._parser.parseString(pattern)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1945, in parseString
    raise exc
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1935, in parseString
    loc, tokens = self._parse(instring, 0)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1836, in _parseCache
    value = self._parseNoCache(instring, loc, doActions, callPreParse)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1675, in _parseNoCache
    loc, tokens = self.parseImpl(instring, preloc, doActions)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 4050, in parseImpl
    loc, exprtokens = e._parse(instring, loc, doActions)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1836, in _parseCache
    value = self._parseNoCache(instring, loc, doActions, callPreParse)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1679, in _parseNoCache
    loc, tokens = self.parseImpl(instring, preloc, doActions)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 3796, in parseImpl
    raise ParseException(instring, loc, self.errmsg, self)
pyparsing.ParseException: Expected end of text, found '-'  (at char 2), (line:1, col:3)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/larsoner/python/matplotlib/lib/matplotlib/backends/backend_qt5.py", line 471, in _draw_idle
    self.draw()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/backends/backend_agg.py", line 397, in draw
    self.figure.draw(self.renderer)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/figure.py", line 1681, in draw
    mimage._draw_list_compositing_images(
  File "/home/larsoner/python/matplotlib/lib/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/cbook/deprecation.py", line 410, in wrapper
    return func(*inner_args, **inner_kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axes/_base.py", line 2747, in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1149, in draw
    ticks_to_draw = self._update_ticks()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1007, in _update_ticks
    major_locs = self.get_majorticklocs()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1268, in get_majorticklocs
    return self.major.locator()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/ticker.py", line 2169, in __call__
    return self.tick_values(vmin, vmax)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/ticker.py", line 2177, in tick_values
    locs = self._raw_ticks(vmin, vmax)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/ticker.py", line 2116, in _raw_ticks
    nbins = np.clip(self.axis.get_tick_space(),
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 2203, in get_tick_space
    size = self._get_tick_label_size('x') * 3
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1328, in _get_tick_label_size
    return mtext.FontProperties(size).get_size_in_points()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/font_manager.py", line 628, in __init__
    self.set_fontconfig_pattern(family)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/font_manager.py", line 840, in set_fontconfig_pattern
    for key, val in parse_fontconfig_pattern(pattern).items():
  File "/home/larsoner/python/matplotlib/lib/matplotlib/fontconfig_pattern.py", line 129, in parse
    raise ValueError(
ValueError: Could not parse font string: 'xx-small'
Expected end of text, found '-'  (at char 2), (line:1, col:3)
Traceback (most recent call last):
  File "/home/larsoner/python/matplotlib/lib/matplotlib/fontconfig_pattern.py", line 127, in parse
    self._parser.parseString(pattern)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1945, in parseString
    raise exc
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1935, in parseString
    loc, tokens = self._parse(instring, 0)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1836, in _parseCache
    value = self._parseNoCache(instring, loc, doActions, callPreParse)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1675, in _parseNoCache
    loc, tokens = self.parseImpl(instring, preloc, doActions)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 4050, in parseImpl
    loc, exprtokens = e._parse(instring, loc, doActions)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1836, in _parseCache
    value = self._parseNoCache(instring, loc, doActions, callPreParse)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 1679, in _parseNoCache
    loc, tokens = self.parseImpl(instring, preloc, doActions)
  File "/home/larsoner/.local/lib/python3.8/site-packages/pyparsing.py", line 3796, in parseImpl
    raise ParseException(instring, loc, self.errmsg, self)
pyparsing.ParseException: Expected end of text, found '-'  (at char 2), (line:1, col:3)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/larsoner/python/matplotlib/lib/matplotlib/backends/backend_qt5.py", line 471, in _draw_idle
    self.draw()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/backends/backend_agg.py", line 397, in draw
    self.figure.draw(self.renderer)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/figure.py", line 1681, in draw
    mimage._draw_list_compositing_images(
  File "/home/larsoner/python/matplotlib/lib/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/cbook/deprecation.py", line 410, in wrapper
    return func(*inner_args, **inner_kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axes/_base.py", line 2747, in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/artist.py", line 41, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1149, in draw
    ticks_to_draw = self._update_ticks()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1007, in _update_ticks
    major_locs = self.get_majorticklocs()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1268, in get_majorticklocs
    return self.major.locator()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/ticker.py", line 2169, in __call__
    return self.tick_values(vmin, vmax)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/ticker.py", line 2177, in tick_values
    locs = self._raw_ticks(vmin, vmax)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/ticker.py", line 2116, in _raw_ticks
    nbins = np.clip(self.axis.get_tick_space(),
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 2203, in get_tick_space
    size = self._get_tick_label_size('x') * 3
  File "/home/larsoner/python/matplotlib/lib/matplotlib/axis.py", line 1328, in _get_tick_label_size
    return mtext.FontProperties(size).get_size_in_points()
  File "/home/larsoner/python/matplotlib/lib/matplotlib/font_manager.py", line 628, in __init__
    self.set_fontconfig_pattern(family)
  File "/home/larsoner/python/matplotlib/lib/matplotlib/font_manager.py", line 840, in set_fontconfig_pattern
    for key, val in parse_fontconfig_pattern(pattern).items():
  File "/home/larsoner/python/matplotlib/lib/matplotlib/fontconfig_pattern.py", line 129, in parse
    raise ValueError(
ValueError: Could not parse font string: 'xx-small'
Expected end of text, found '-'  (at char 2), (line:1, col:3)

cc author of the PR @QuLogic and committer @timhoffm

I can confirm that git revert 222b3ba (followed by a conflict resolution) fixes this minimal example for me.

I have a fix for this coming.

FIX: correctly process the tick label size

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BUG: Setting ticksize xx-small broken by #17348 #17670

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BUG: Setting ticksize xx-small broken by #17348 #17670

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larsoner commented on Jun 18, 2020

tacaswell commented on Jun 18, 2020

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