/usr/lib/python3/dist-packages/matplotlib-1.3.1-nspkg.pth is in python3-matplotlib 1.3.1-1ubuntu5.
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1 | import sys,types,os; p = os.path.join(sys._getframe(1).f_locals['sitedir'], *('mpl_toolkits',)); ie = os.path.exists(os.path.join(p,'__init__.py')); m = not ie and sys.modules.setdefault('mpl_toolkits',types.ModuleType('mpl_toolkits')); mp = (m or []) and m.__dict__.setdefault('__path__',[]); (p not in mp) and mp.append(p)
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