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tuple() -> empty tuple
tuple(iterable) -> tuple initialized from iterable's items

If the argument is a tuple, the return value is the same object.

src/s/y/sympy-HEAD/sympy/core/tests/test_numbers.py   sympy(Download)
    assert _normalize(mpf, 53) != (0, long(0), 0, 0)
    from sympy.mpmath.libmp.libmpf import fnan
    assert mlib.mpf_eq(fnan, fnan)