Log plots (semilogx, semilogy and loglog) crash with type error

[felixzero]

Hello, I am currently running matplotlib 1.3.1 with Python 2.7 on Windows XP, and since the upgrade I am unable to plot even a simple log plot.
Here is an example of minimal code that bugs:

from pylab import *
from numpy import *

x = linspace(1, 10, 100)
y = 2*sqrt(x)

semilogy(x, y)
show()

This code raises to following type error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1410, in __call__
    return self.func(*args)
  File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 276, in resize
    self.show()
  File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 348, in draw
    FigureCanvasAgg.draw(self)
  File "C:\Python27\lib\site-packages\matplotlib\backends\backend_agg.py", line 451, in draw
    self.figure.draw(self.renderer)
  File "C:\Python27\lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Python27\lib\site-packages\matplotlib\figure.py", line 1034, in draw
    func(*args)
  File "C:\Python27\lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Python27\lib\site-packages\matplotlib\axes.py", line 2086, in draw
    a.draw(renderer)
  File "C:\Python27\lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Python27\lib\site-packages\matplotlib\axis.py", line 1093, in draw
    renderer)
  File "C:\Python27\lib\site-packages\matplotlib\axis.py", line 1042, in _get_tick_bboxes
    extent = tick.label1.get_window_extent(renderer)
  File "C:\Python27\lib\site-packages\matplotlib\text.py", line 754, in get_window_extent
    bbox, info, descent = self._get_layout(self._renderer)
  File "C:\Python27\lib\site-packages\matplotlib\text.py", line 329, in _get_layout
    ismath=ismath)
  File "C:\Python27\lib\site-packages\matplotlib\backends\backend_agg.py", line 210, in get_text_width_height_descent
    self.mathtext_parser.parse(s, self.dpi, prop)
  File "C:\Python27\lib\site-packages\matplotlib\mathtext.py", line 3009, in parse
    self.__class__._parser = Parser()
  File "C:\Python27\lib\site-packages\matplotlib\mathtext.py", line 2193, in __init__
    - ((lbrace + float_literal + rbrace)
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

Regards,
felixzero

[tacaswell]

Remove the pyparsing files in the matplotlib install directory, and reinstall pyparsing as a stand alone if necessary.

[felixzero]

Thank you, it works.