user warning in flexure tutorial

[jennyknuth]

at step 3 get this user warning:

/Users/jennyknuth/anaconda/lib/python2.7/site-packages/matplotlib/init.py:1350: UserWarning: This call to matplotlib.use() has no effect
because 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)

[jadams15]

I think this is a pretty standard warning, and one we can maybe ignore?