Comment #20 on issue 1727 by asmeurer: fix namespace clashes http://code.google.com/p/sympy/issues/detail?id=1727
See https://github.com/sympy/sympy/pull/79. Thanks to __abs__, abs() did not have to be replaced with Abs in many cases. In fact, many files were already using the built-in abs() instead of SymPy's abs(), assumedly without even realizing it.
Looking through http://docs.python.org/library/functions.html, I don't think we have any more built-in overrides, except for any() and all() because of the Python 2.4 compatibility (and those are actually clever enough to not really override in Python 2.5+).
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