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Limit special-casing of _ variable to doctests....
Limit special-casing of _ variable to doctests. In doctests, _ *must* be special-cased and removed from the user's namespace because otherwise Python won't set it. But we were doing this special-casing unconditionally, making it impossible to write unittests that checked the _ variable after cell execution. This commit makes the special-casing of _ apply only in the doctest execution (where it's needed) and leaves normal unittests alone.
Fernando Perez -
r3299:827b2686
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