Homebrew python: default interactive plotting with Matplotlib

One thing I noticed with my homebrew installation of matplotlib was that the interactive plotting was disabled by default. Turning it on was a simple matter of finding and editing the matplotlibrc file:

$ ipython
In [1]: import matplotlib as mpl

In [2]: mpl.matplotlib_fname()
Out[2]: '/usr/local/Cellar/python/2.7.2/lib/python2.7/site-packages/matplotlib-1.1.0-py2.7-macosx-10.4-x86_64.egg/matplotlib/mpl-data/matplotlibrc'

In [3]: !vi /usr/local/Cellar/python/2.7.2/lib/python2.7/site-packages/matplotlib-1.1.0-py2.7-macosx-10.4-x86_64.egg/matplotlib/mpl-data/matplotlibrc

I set the following lines:

# backend : MacOSX
backend : TkAgg
[...]
backend_fallback: True
[...]
interactive : True

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