Comment #12 on issue 3434 by hacm...@gmail.com: warning when starting isympy
http://code.google.com/p/sympy/issues/detail?id=3434
The issue, as pointed out before, is that sympy/__init__.py imports
sympy.plotting, which in turn imports matplotlib.pyplot. isympy imports
functionality from elsewhere in sympy, which causes sympy/__init__.py to be
imported. Then isympy, via sympy.interatcive.session.init_session(),
initializes pylab, which calls matplotlib.use(), raising the warning. As I
see it, there are several options for dealing with this:
1. slightly hacky, but expedient: suppress warnings before running
ip.enable_pylab() in sympy.interatcive.session.init_session(). This can be
done with
http://docs.python.org/2/library/warnings.html#warnings.catch_warnings ,
which is python 2.6+, but is a small amount of code to put into the
compatibility module. This has the disadvantage of suppressing any valid
warnings that might arise.
2. refactor plotting import: actually relatively straightforward, since
matplotlib.pyplot is only used inside of one class
(sympy.plotting.plot.MatplotlibBackend), so the import can be done within
the __init__() method and a reference can be kept for the other functions.
The downside is that this class is instantiated every time the plot()
function is called (actually in the Plot.show() method).
3. refactor call of pylab initialize: probably the most work, possibly the
most correct. Initialize pylab before any SymPy modules are imported. This
would require moving a lot of code into the isympy script, among other
things.
I would be happy to knock out solution 1 or 2 (between those, my preference
is 2). I could be convinced to do 3, also, if people think that is best.
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