#!/usr/bin/python
# -*- coding: utf-8 -*-
import time

try:
    xrange
except NameError:
    xrange = range

def main():
    for f in [call_once,
              call_conditionally_mod,
              call_twice,
              iterate_twice,
              try_except,
              floating_point_arithmetic]:
        print('%6.2fμs %s' % (1e6 * timetil(f), f.__name__))

def timetil(f):
    n = 1
    mindur = None
    while True:
        start = time.time()
        f(n)
        dur = time.time() - start
        if mindur is None or dur < mindur:
            mindur = dur
        if dur - mindur > 1.0:
            return (dur - mindur) / n
        n *= 2

def nop():
    pass

def call_once(n):
    for i in xrange(n):
        nop()

def call_conditionally_mod(n):
    for i in xrange(n):
        if i % 2:
            nop()
        else:
            nop()

def call_twice(n):
    for i in xrange(n):
        call_once(1)

def iterate_twice(n):
    for i in xrange(n):
        for i in xrange(1):
            nop()

def floating_point_arithmetic(n):
    k = 1.0
    for i in xrange(n):
        k *= i

def try_except(n):
    for i in xrange(n):
        try:
            raise Exception
        except Exception:
            pass

if __name__ == '__main__':
    main()