[Matplotlib-users] Problem with importing LaTeX package amsmath and $\text{}$

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Hello,

I've been having some troubles with LaTeX in matplotlib. My example script:

#!/usr/bin/env python2
#-*- coding: utf-8 -*-

__author__ = 'Pawel Chojnacki'
__copyright__ ='Copyleft 2013 Pawel Chojnacki'
__version__ = '1.0'
__date__ = '29-03-2013'
__license__ = 'GPLv3'

import numpy as np
import matplotlib as mpl # Zmiana ustawien LaTeXa
mpl.rcParams['text.latex.preamble'].append(r'\usepackage{amsmath}')
#~ mpl.rcParams['text.latex.preamble'] = r'\usepackage{amsmath}'
#~ mpl.rcParams['text.latex.preamble']=[r"\usepackage{amsmath}"]
#~ mpl.rcParams['math.usetex'] = True
print mpl.rcParams['text.latex.preamble']
import pylab as py

py.axhspan(8400,8730,alpha=0.15)
py.title(u'Wyniki eksperymentu pomiaru gęstości ciała
stałego\n',size='large',family='serif')
py.ylabel((u'Gęstość ciała stałego ' +
r'$\frac{kg}{m^3}$'),size='large',family='serif')
#~ py.ylabel((r'$\text{lol}$'),size='large',family='serif')
py.ylabel((r'$\text{lol}$'),size='large',family='serif')
py.xlabel(u'Metoda pomiaru',size='large',family='serif')
py.grid(True)
py.show()

Gives me the following output:

['', '\\usepackage{amsmath}']
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1437, in __call__
    return self.func(*args)
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py",
line 236, in resize
    self.show()
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py",
line 239, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py",
line 421, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in
draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/figure.py", line 898, in
draw
    func(*args)
  File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in
draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 1997, in draw
    a.draw(renderer)
  File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in
draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/axis.py", line 1054, in draw
    self.label.draw(renderer)
  File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in
draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/text.py", line 526, in draw
    bbox, info = self._get_layout(renderer)
  File "/usr/lib/pymodules/python2.7/matplotlib/text.py", line 309, in
_get_layout
    ismath=ismath)
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py",
line 193, in get_text_width_height_descent
    self.mathtext_parser.parse(s, self.dpi, prop)
  File "/usr/lib/pymodules/python2.7/matplotlib/mathtext.py", line 2999, in
parse
    box = self._parser.parse(s, font_output, fontsize, dpi)
  File "/usr/lib/pymodules/python2.7/matplotlib/mathtext.py", line 2357, in
parse
    self._expression.parseString(s)
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 1048,
in parseString
    loc, tokens = self._parse( instring, 0 )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 981, in
_parseCache
    value = self._parseNoCache( instring, loc, doActions, callPreParse )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 924, in
_parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 2559,
in parseImpl
    return self.expr._parse( instring, loc, doActions, callPreParse=False )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 981, in
_parseCache
    value = self._parseNoCache( instring, loc, doActions, callPreParse )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 924, in
_parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 2307,
in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 981, in
_parseCache
    value = self._parseNoCache( instring, loc, doActions, callPreParse )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 924, in
_parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 2672,
in parseImpl
    loc, tokens = self.expr._parse( instring, loc, doActions,
callPreParse=False )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 981, in
_parseCache
    value = self._parseNoCache( instring, loc, doActions, callPreParse )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 924, in
_parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 2307,
in parseImpl
    loc, exprtokens = e._parse( instring, loc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 981, in
_parseCache
    value = self._parseNoCache( instring, loc, doActions, callPreParse )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 924, in
_parseNoCache
    loc,tokens = self.parseImpl( instring, preloc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 2416,
in parseImpl
    ret = e._parse( instring, loc, doActions )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 981, in
_parseCache
    value = self._parseNoCache( instring, loc, doActions, callPreParse )
  File "/usr/lib/pymodules/python2.7/matplotlib/pyparsing.py", line 950, in
_parseNoCache
    tokens = fn( instring, tokensStart, retTokens )
  File "/usr/lib/pymodules/python2.7/matplotlib/mathtext.py", line 2050, in
raise_error
    raise ParseFatalException(msg + "\n" + s)
ParseFatalException: Expected end of math '$'
$\text{lol}$ (at char 0), (line:1, col:1)

And a blank window. The same line - $\text{lol}$ works pretty well in pure
LaTeX. While the package seems loaded, matplotlib doesn't send the command
as it's supposed to. Why is that?

Thanks in advance,

Pawel