def profile_function(function, *args, **kwargs):
    """ Returns performance statistics (as a string) for the given function.
    """
    def _run():
        function(*args, **kwargs)
    import cProfile as profile
    import pstats
    import os
    import sys; sys.modules['__main__'].__profile_run__ = _run
    id = function.__name__ + '()'
    profile.run('__profile_run__()', id)
    p = pstats.Stats(id)
    p.stream = open(id, 'w')
    p.sort_stats('time').print_stats(20)
    p.stream.close()
    s = open(id).read()
    os.remove(id)
    return s

def int_to_str_with_check(s):
    if s.isdigit():
        return int(s)
    return None

def int_to_str_with_exception(s):
    try:
        return int(s)
    except ValueError:
        return None

NUM_ITERATIONS = 10000000

def test_check():
    s = '10'
    sum = 0
    for i in range(NUM_ITERATIONS):
        sum += int_to_str_with_check(s)
    return sum

def test_exception():
    s = '10'
    sum = 0
    for i in range(NUM_ITERATIONS):
        sum += int_to_str_with_exception(s)
    return sum


print(profile_function(test_check))
print(profile_function(test_exception))






python profile_books.py
Thu Oct 18 13:16:07 2018    test_check()

         20000005 function calls in 7.148 seconds

   Ordered by: internal time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
 10000000    4.054    0.000    4.850    0.000 profile_books.py:20(int_to_str_with_check)
        1    2.298    2.298    7.148    7.148 profile_books.py:33(test_check)
 10000000    0.796    0.000    0.796    0.000 {method 'isdigit' of 'str' objects}
        1    0.000    0.000    7.148    7.148 {built-in method builtins.exec}
        1    0.000    0.000    7.148    7.148 <string>:1(<module>)
        1    0.000    0.000    7.148    7.148 profile_books.py:4(_run)
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}



Thu Oct 18 13:16:12 2018    test_exception()

         10000005 function calls in 5.136 seconds

   Ordered by: internal time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
 10000000    2.897    0.000    2.897    0.000 profile_books.py:25(int_to_str_with_exception)
        1    2.239    2.239    5.136    5.136 profile_books.py:40(test_exception)
        1    0.000    0.000    5.136    5.136 {built-in method builtins.exec}
        1    0.000    0.000    5.136    5.136 profile_books.py:4(_run)
        1    0.000    0.000    5.136    5.136 <string>:1(<module>)
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}