# special method __len__ dispatch

import time

class Num(object):

def __init__(self, n):

self.n = n

def __len__(self):

return self.n

def __repr__(self):

return repr(self.n)

def do_compute(num):

for i in range(num):

sum_ = 0

one = Num(42)

j = 0

while j < num:

sum_ = sum_ + len(one)

j += 1

return sum_

def measure(num):

for run in range(3):

do_compute(20000) # 10000

print("Start timing...")

start = time.time()

for run in range(num):

sum_ = do_compute(20000) # 10000

print("sum", sum_)

duration = "%.3f\n" % (time.time() - start)

print("special-len: " + duration)

print('warming up ...')

for run in range(2000):

do_compute(5) # 1000

measure(5)