Comment #7 on issue 3434 by julien.r...@gmail.com: warning when starting isympy
http://code.google.com/p/sympy/issues/detail?id=3434

./bin/isympy
/home/jacobi/jrioux/git/sympy/matplotlib/__init__.py:997: UserWarning: This call to matplotlib.use() has no effect
because the the backend has already been chosen;
matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.

  warnings.warn(_use_error_msg)

Welcome to pylab, a matplotlib-based Python environment [backend: TkAgg].
For more information, type 'help(pylab)'.
IPython console for SymPy 0.7.2.rc1 (Python 2.7.2-64-bit) (ground types: python)

These commands were executed:
from __future__ import division
from sympy import *
x, y, z, t = symbols('x y z t')
k, m, n = symbols('k m n', integer=True)
f, g, h = symbols('f g h', cls=Function)

Documentation can be found at http://www.sympy.org

In [1]: import matplotlib

In [2]: matplotlib.__version__
Out[2]: 1.3.x


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