Comment #1 on issue 2024 by asmeurer: Implement 'with' statement for assumptions.
http://code.google.com/p/sympy/issues/detail?id=2024

The only problem is that with doesn't work in Python 2.4, so we will either have to not use it in library code and test it using exec, or else drop support. And for 2.5, we have to import it from __future__, but that's fine (we already do that with division anyway).

You can also do

with context as target:

and the return value of __enter__() will be assigned to target (see http://docs.python.org/reference/compound_stmts.html#with, #4). I wonder if/how that should be used in this case.

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