Estou tentando usar o pylab (por exemplo, $ ipython3 --pylab ) no Python 3 no Ubuntu 14.04. Estou com o mesmo erro, independentemente de usar os back-ends do Tkinter ou do Qt4.
AttributeError: 'FontManager' object has no attribute 'ttf_lookup_cache'
Esta mesma rotina de plotagem básica ( plt.plot([1,2,3,4]) ) funciona no Python 2 pylab, no entanto.
Eu instalei as dependências necessárias, para o meu conhecimento (note, tanto para o Python 2 quanto para o Python 3):
sudo apt-get install python-numpy python-scipy python-matplotlib
sudo apt-get install python3-numpy python3-scipy python3-matplotlib
sudo apt-get install python-tk python3-tk
sudo apt-get install libqt4gui libqt4core python-qt4 python3-qt4
Tracebacks completos estão disponíveis abaixo. Aqui está o Tkinter:
$ ipython3 --matplotlib tk
Python 3.4.0 (default, Apr 11 2014, 13:05:11)
Type "copyright", "credits" or "license" for more information.
IPython 1.2.1 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: import matplotlib.pyplot as plt
In [2]: plt.plot([1,2,3,4])
Out[2]: [<matplotlib.lines.Line2D at 0x7f1496dc9c50>]
In [3]: Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python3.4/tkinter/__init__.py", line 1490, in __call__
return self.func(*args)
File "/usr/lib/python3.4/tkinter/__init__.py", line 535, in callit
func(*args)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_tkagg.py", line 363, in idle_draw
self.draw()
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_tkagg.py", line 348, in draw
FigureCanvasAgg.draw(self)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 451, in draw
self.figure.draw(self.renderer)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 56, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1035, in draw
func(*args)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 56, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/axes.py", line 2088, in draw
a.draw(renderer)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 56, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/axis.py", line 1094, in draw
renderer)
File "/usr/lib/python3/dist-packages/matplotlib/axis.py", line 1043, in _get_tick_bboxes
extent = tick.label1.get_window_extent(renderer)
File "/usr/lib/python3/dist-packages/matplotlib/text.py", line 755, in get_window_extent
bbox, info, descent = self._get_layout(self._renderer)
File "/usr/lib/python3/dist-packages/matplotlib/text.py", line 321, in _get_layout
ismath=False)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 214, in get_text_width_height_descent
font = self._get_agg_font(prop)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 258, in _get_agg_font
fname = findfont(prop)
File "/usr/lib/python3/dist-packages/matplotlib/font_manager.py", line 1362, in findfont
font = fontManager.findfont(prop, **kw)
File "/usr/lib/python3/dist-packages/matplotlib/font_manager.py", line 1202, in findfont
font_cache = self.ttf_lookup_cache
AttributeError: 'FontManager' object has no attribute 'ttf_lookup_cache'
E aqui está o Qt / Qt4:
$ ipython3 --matplotlib qt
WARNING: Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv.
Python 3.4.0 (default, Apr 11 2014, 13:05:11)
Type "copyright", "credits" or "license" for more information.
IPython 1.2.1 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: import matplotlib.pyplot as plt
In [2]: plt.plot([1,2,3,4])
Out[2]: [<matplotlib.lines.Line2D at 0x7f0f840947f0>]
In [3]: Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_qt4.py", line 374, in idle_draw
self.draw()
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_qt4agg.py", line 154, in draw
FigureCanvasAgg.draw(self)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 451, in draw
self.figure.draw(self.renderer)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 56, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1035, in draw
func(*args)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 56, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/axes.py", line 2088, in draw
a.draw(renderer)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 56, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/axis.py", line 1094, in draw
renderer)
File "/usr/lib/python3/dist-packages/matplotlib/axis.py", line 1043, in _get_tick_bboxes
extent = tick.label1.get_window_extent(renderer)
File "/usr/lib/python3/dist-packages/matplotlib/text.py", line 755, in get_window_extent
bbox, info, descent = self._get_layout(self._renderer)
File "/usr/lib/python3/dist-packages/matplotlib/text.py", line 321, in _get_layout
ismath=False)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 214, in get_text_width_height_descent
font = self._get_agg_font(prop)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 258, in _get_agg_font
fname = findfont(prop)
File "/usr/lib/python3/dist-packages/matplotlib/font_manager.py", line 1362, in findfont
font = fontManager.findfont(prop, **kw)
File "/usr/lib/python3/dist-packages/matplotlib/font_manager.py", line 1202, in findfont
font_cache = self.ttf_lookup_cache
AttributeError: 'FontManager' object has no attribute 'ttf_lookup_cache'
If you suspect this is an IPython bug, please report it at:
https://github.com/ipython/ipython/issues
or send an email to the mailing list at [email protected]
You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.
Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
%config Application.verbose_crash=True
Em ambos os casos, a janela de plotagem é exibida. No caso do Tkinter, o enredo está em branco (vazio), mas com Qt4 eu vejo o resultado correto - E o erro ainda dispara. Novamente, isso funciona bem com o backend no Python 2.7. O que estou perdendo?
Consegui resolver esse problema removendo meu cache de fontes matplotlib (os caches de fontes Python 3 e Python 2), por exemplo,
rm /home/arthur/.cache/matplotlib/fontList*.cache
Agora posso usar qualquer outra inicialização de ambiente seguinte sem erros:
ipython3 --pylab
ipython3 --matplotlib tk
ipython3 --matplotlib qt4
Tags python python3 qt matplotlib tkinter