import datetime def time_1(): begin = datetime.datetime.now() sum = 0 for i in xrange(10000000):  sum = sum + i end = datetime.datetime.now() return end-beginprint time_1()

In [5]: import timeitIn [6]: timeit.timeit("sum(range(100))")Out[6]: 1.2272648811340332

➜ Python python -m timeit -s"import time_1 as t" "t.time_1()"0:00:00.28204410 loops, best of 3: 279 msec per loop

 import datetime def time_1(): begin = datetime.datetime.now() sum = 0 for i in xrange(10000000):  sum = sum + i end = datetime.datetime.now() return end-begin if __name__ == '__main__': print time_1()import cProfile cProfile.run('time_1()')

➜ Python python time_1.py0:00:00.282828  2 function calls in 0.000 seconds  Ordered by: standard name ncalls tottime percall cumtime percall filename:lineno(function) 1 0.000 0.000 0.000 0.000 <string>:1(<module>) 1 0.000 0.000 0.000 0.000 {method 'disable' of '_lsprof.Profiler' objects}Traceback (most recent call last): File "time_1.py", line 15, in <module> cProfile.run('main()') File "/usr/lib/python2.7/cProfile.py", line 29, in run prof = prof.run(statement) File "/usr/lib/python2.7/cProfile.py", line 135, in run return self.runctx(cmd, dict, dict) File "/usr/lib/python2.7/cProfile.py", line 140, in runctx exec cmd in globals, locals File "<string>", line 1, in <module>NameError: name 'main' is not defined➜ Python vi time_1.py➜ Python python time_1.py0:00:00.284642  5 function calls in 0.281 seconds Ordered by: standard name ncalls tottime percall cumtime percall filename:lineno(function) 1 0.000 0.000 0.281 0.281 <string>:1(<module>) 1 0.281 0.281 0.281 0.281 time_1.py:3(time_1) 2 0.000 0.000 0.000 0.000 {built-in method now} 1 0.000 0.000 0.000 0.000 {method 'disable' of '_lsprof.Profiler' objects}