Comment #4 on issue 2608 by vlada.pe...@gmail.com: test_pickling errors
under Python 3
http://code.google.com/p/sympy/issues/detail?id=2608
Yes, a quick search leads me to this issue upstream:
http://bugs.python.org/issue9666 ("'hasattr' fix to suppress only
AttributeError"). To quote the discussion linked to in the issue (also
worth a read):
"
>>> class Test:
... @property
... def attr(self):
... self['foo']
...
>>> hasattr(Test(), 'attr')
False
There can be any exception instead of KeyError in the above snippet of
code, but this small example shows how 'hasattr': misleadingly breaks the
code logic (1) and masks bug (2).
"
(this is exactly the code we use in the Printer class, btw)
So yeah, this basically means some/many of our properties are actually
wrong and we needed a port to Python 3 and an obscure pickle test to see
this. For the two cases I catch here I have a fix, but this is probably
something that should be checked/modified all around SymPy.
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