import perf
import decimal
from six.moves import xrange

def bench(loops):
    Decimal = decimal.Decimal
    localcontext = decimal.localcontext
    range_it = xrange(loops)

    t0 = perf.perf_counter()
    for _ in range_it:

        with localcontext() as c:
            c.prec = 2
            with localcontext() as x:
                x.prec = 4
                Decimal(10) / 3
            Decimal(10) / 3

    dt = perf.perf_counter() - t0
    return dt

if __name__ == '__main__':
    runner = perf.Runner()
    runner.bench_time_func('decimal.localcontext', bench)