Comment #7 on issue 2786 by [email protected]: Fill in missing tests for sympy.physics module in test_args.py
http://code.google.com/p/sympy/issues/detail?id=2786
See issue 2070. The reason is that many algorithms work by recursing through the .args, and that attribute is only there if it is an instance of Basic.
Aside from that, it's impossible to see what was put in the lambda once it's in there. So things like manipulating the code of the lambda or pretty printing it are out of the picture. It would be better to use a Lambda, when possible.
But if I understand OracleGate properly, it really should be able to take anything, because it represents an oracle (http://en.wikipedia.org/wiki/Oracle_machine). But I think at the very least a Lambda should be preferred when it works.
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