Comment #8 on issue 834 by fedot...@gmail.com: hasattr(Triangle(*p), "bisectors") hangs
http://code.google.com/p/sympy/issues/detail?id=834
I think removing "@property" for most attributes in Triangle, Polygon and other classes of polygon.py is a good idea. The basic reason is properties disguise themselves as simple attributes. But actually they needs not very primitive calculations. A method indicates that it might be an expensive operation, and developers using the class will consider caching the value rather than fetching it again and again.
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