Comment #4 on issue 2052 by mattpap: is_number needs a new name (was "is_number could do more")
http://code.google.com/p/sympy/issues/detail?id=2052
Maybe consider using new assumptions (queries) for this, add new predicate Q.number and then you could do ask(expr, Q.number). In ask handlers you can use whatever functionality of SymPy you want, as opposed to core.
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