future.builtins module is also accessible as
builtins on Py2.
pow()supports fractional exponents of negative numbers like in Py3:
>>> from builtins import pow >>> pow(-1, 0.5) (6.123233995736766e-17+1j)
round()uses Banker’s Rounding as in Py3 to the nearest even last digit:
>>> from builtins import round >>> assert round(0.1250, 2) == 0.12