gistfile1.txt

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "//anaconda/lib/python2.7/site-packages/matplotlib-1.4.1-py2.7-macosx-10.5-x86_64.egg/pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "//anaconda/lib/python2.7/site-packages/matplotlib-1.4.1-py2.7-macosx-10.5-x86_64.egg/matplotlib/pylab.py", line 274, in <module>
    from matplotlib.pyplot import *
  File "//anaconda/lib/python2.7/site-packages/matplotlib-1.4.1-py2.7-macosx-10.5-x86_64.egg/matplotlib/pyplot.py", line 109, in <module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "//anaconda/lib/python2.7/site-packages/matplotlib-1.4.1-py2.7-macosx-10.5-x86_64.egg/matplotlib/backends/__init__.py", line 32, in pylab_setup
    globals(),locals(),[backend_name],0)
  File "//anaconda/lib/python2.7/site-packages/matplotlib-1.4.1-py2.7-macosx-10.5-x86_64.egg/matplotlib/backends/backend_tkagg.py", line 13, in <module>
    import matplotlib.backends.tkagg as tkagg
  File "//anaconda/lib/python2.7/site-packages/matplotlib-1.4.1-py2.7-macosx-10.5-x86_64.egg/matplotlib/backends/tkagg.py", line 7, in <module>
    from matplotlib.backends import _tkagg
ImportError: cannot import name _tkagg

You have the latest version of XQuartz, right? I would try conda update matplotlib and see if that already helps. Unfortunately, this error is much harder to understand.