timeit versus timing decorator

Use wrapping from functools to improve Matt Alcock's answer.

from functools import wraps
from time import time

def timing(f):
    @wraps(f)
    def wrap(*args, **kw):
        ts = time()
        result = f(*args, **kw)
        te = time()
        print 'func:%r args:[%r, %r] took: %2.4f sec' % \
          (f.__name__, args, kw, te-ts)
        return result
    return wrap

In an example:

@timing
def f(a):
    for _ in range(a):
        i = 0
    return -1

Invoking method f wrapped with @timing:

func:'f' args:[(100000000,), {}] took: 14.2240 sec
f(100000000)

The advantage of this is that it preserves attributes of the original function; that is, metadata like the function name and docstring is correctly preserved on the returned function.

I would use a timing decorator, because you can use annotations to sprinkle the timing around your code rather than making you code messy with timing logic.

import time

def timeit(f):

    def timed(*args, **kw):

        ts = time.time()
        result = f(*args, **kw)
        te = time.time()

        print 'func:%r args:[%r, %r] took: %2.4f sec' % \
          (f.__name__, args, kw, te-ts)
        return result

    return timed

Using the decorator is easy either use annotations.

@timeit
def compute_magic(n):
     #function definition
     #....

Or re-alias the function you want to time.

compute_magic = timeit(compute_magic)

Use timeit. Running the test more than once gives me much better results.

func_list=[locals()[key] for key in locals().keys() 
           if callable(locals()[key]) and key.startswith('time')]

alist=range(1000000)
times=[]
for f in func_list:
    n = 10
    times.append( min(  t for t,_,_ in (f(alist,31) for i in range(n)))) 

for (time,func_name) in zip(times, func_list):
    print '%s took %0.3fms.' % (func_name, time*1000.)

->

<function wrapper at 0x01FCB5F0> took 39.000ms.
<function wrapper at 0x01FCB670> took 41.000ms.

Inspired by Micah Smith's answer, I made funcy print directly instead (and not use logging module).

Below is convenient for use at google colab.

# pip install funcy
from funcy import print_durations

@print_durations()
def myfunc(n=0):
  for i in range(n):
    pass

myfunc(123)
myfunc(123456789)

# 5.48 mks in myfunc(123)
# 3.37 s in myfunc(123456789)