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sage: def f(n):
...        if abs(n-n.integer_part())<1*e-10:
...            return n.integer_part()
...        else:
...            return n
sage: n=5.0000000000000001
sage: f(n)

    5.000000000000000

sage: type(f(n))
<type 'sage.rings.real_mpfr.RealLiteral'>
sage: n.integer_part()
5
sage: n.integer_part()==5
True
sage: f(n)==5
False