$ python SEOCheckCharting.py
Traceback (most recent call last):
  File "SEOCheckCharting.py", line 30, in <module>
    fig = plt.figure()
  File "/usr/lib/pymodules/python2.6/matplotlib/pyplot.py", line 254, in figure
    **kwargs)
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_tkagg.py", line 90, in new_figure_manager
    window = Tk.Tk()
  File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1646, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable