Comment #10 on issue 880 by [email protected]: make Matrix.hash the same as
Matrix.__hash__
http://code.google.com/p/sympy/issues/detail?id=880
If the `__hash__` is removed then the following failure occurs under Python
3.2:
sympy/physics/quantum/tests/test_gate.py:test_UGate ______________
4112
File "/home/travis/virtualenv/python3.2/lib/python3.2/site-packages/sympy/physics/quantum/tests/test_gate.py",
line 48, in test_UGate
4113 assert qapply(u1*Qubit('0')) == a*Qubit('0') + c*Qubit('1')
4114
File "/home/travis/virtualenv/python3.2/lib/python3.2/site-packages/sympy/core/decorators.py",
line 67, in __sympifyit_wrapper
4115 return func(a, sympify(b, strict=True))
4116
File "/home/travis/virtualenv/python3.2/lib/python3.2/site-packages/sympy/core/decorators.py",
line 108, in binary_op_wrapper
4117 return func(self, other)
4118
File "/home/travis/virtualenv/python3.2/lib/python3.2/site-packages/sympy/core/expr.py",
line 146, in __mul__
4119 return Mul(self, other)
4120
File "/home/travis/virtualenv/python3.2/lib/python3.2/site-packages/sympy/core/cache.py",
line 85, in wrapper
4121 return func_cache_it_cache[k]
4122
File "/home/travis/virtualenv/python3.2/lib/python3.2/site-packages/sympy/core/basic.py",
line 109, in __hash__
4123 h = hash((type(self).__name__,) + self._hashable_content())
4124TypeError: unhashable type: 'MutableDenseMatrix'
So the removal (though not necessarily difficult) is not trivial.
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