Updates:
Summary: <Matrix Object>.nonexistantattribute() should raise more
informative AttributeError
Status: Accepted
Comment #7 on issue 1822 by asmeurer: <Matrix
Object>.nonexistantattribute() should raise more informative AttributeError
http://code.google.com/p/sympy/issues/detail?id=1822
Ah, I didn't catch that.
Aren't you supposed to be able to return NotImplemented or something and it
will raise AttributeError for you. Otherwise, we
should just emulate the standard AttributeError("'Matrix' object has not
attribute 'berkowitz_eigenvalues'").
Or, why can't we just implement .diff, etc. like everything else and not
mess with __getattr__()?
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