---------------------------------------------------------------------------
TclError                                  Traceback (most recent call last)
<ipython-input-2-8dd816f9ddc7> in <module>()
----> 1 plt.plot([1, 2], [1, 2])

/home/goldbaum/.virtualenvs/yt-dev/local/lib/python2.7/site-packages/matplotlib/pyplot.pyc in plot(*args, **kwargs)
   3145 @_autogen_docstring(Axes.plot)
   3146 def plot(*args, **kwargs):
-> 3147     ax = gca()
   3148     # allow callers to override the hold state by passing hold=True|False
   3149     washold = ax.ishold()

/home/goldbaum/.virtualenvs/yt-dev/local/lib/python2.7/site-packages/matplotlib/pyplot.pyc in gca(**kwargs)
    926     matplotlib.figure.Figure.gca : The figure's gca method.
    927     """
--> 928     return gcf().gca(**kwargs)
    929
    930 # More ways of creating axes:

/home/goldbaum/.virtualenvs/yt-dev/local/lib/python2.7/site-packages/matplotlib/pyplot.pyc in gcf()
    576         return figManager.canvas.figure
    577     else:
--> 578         return figure()
    579
    580

/home/goldbaum/.virtualenvs/yt-dev/local/lib/python2.7/site-packages/matplotlib/pyplot.pyc in figure(num, figsize, dpi, facecolor, edgecolor, frameon, FigureClass, **kwargs)
    525                                         frameon=frameon,
    526                                         FigureClass=FigureClass,
--> 527                                         **kwargs)
    528
    529         if figLabel:

/home/goldbaum/.virtualenvs/yt-dev/local/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.pyc in new_figure_manager(num, *args, **kwargs)
     82     FigureClass = kwargs.pop('FigureClass', Figure)
     83     figure = FigureClass(*args, **kwargs)
---> 84     return new_figure_manager_given_figure(num, figure)
     85
     86

/home/goldbaum/.virtualenvs/yt-dev/local/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.pyc in new_figure_manager_given_figure(num, figure)
     90     """
     91     _focus = windowing.FocusManager()
---> 92     window = Tk.Tk()
     93     window.withdraw()
     94

/usr/lib/python2.7/lib-tk/Tkinter.pyc in __init__(self, screenName, baseName, className, useTk, sync, use)
   1765                 baseName = baseName + ext
   1766         interactive = 0
-> 1767         self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
   1768         if useTk:
   1769             self._loadtk()

TclError: no display name and no $DISPLAY environment variable