xiliu@master:/tmp/matplotlib-0.99.1.1$ python Python 2.6 (r26:66714, Nov 3 2009, 17:33:38) [GCC 4.4.1 20090725 (Red Hat 4.4.1-2)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import matplotlib.pyplot as plt Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 6, in <module> from matplotlib.figure import Figure, figaspect File "/usr/lib/python2.6/site-packages/matplotlib/figure.py", line 18, in <module> from axes import Axes, SubplotBase, subplot_class_factory File "/usr/lib/python2.6/site-packages/matplotlib/axes.py", line 24, in <module> import matplotlib.spines as mspines File "/usr/lib/python2.6/site-packages/matplotlib/spines.py", line 17, in <module> class Spine(mpatches.Patch): File "/usr/lib/python2.6/site-packages/matplotlib/spines.py", line 39, in Spine @docstring.dedent_interpd File "/usr/lib/python2.6/site-packages/matplotlib/docstring.py", line 103, in dedent_interpd return interpd(dedent(func)) File "/usr/lib/python2.6/site-packages/matplotlib/docstring.py", line 36, in __call__ func.__doc__ = func.__doc__ and func.__doc__ % self.params KeyError: 'Patch' >>>