bench_mark_try_except.py

# ref:https://stackoverflow.com/a/20308693/938077

from timeit import timeit

size = 2**10
allkeys = "0% missing keys", dict([(i, 0) for i in range(size)])
somekeys = "50% missing keys", dict([(i*2, 0) for i in range(size//2)])
nokeys = "100% missing keys", dict([])


def test_normal():
    """Standard access"""
    for i in range(size):
        v = d.get(i)
        if not v:
            d[i] = 1


def test_try():
    """try/except access"""
    for i in range(size):
        try:
            v = d[i]
        except KeyError:
            d[i] = 1


for trial in (allkeys, somekeys, nokeys):
    d = trial[1]
    for test in (test_try, test_normal):
        trial_time = timeit("test()",
                            setup="from __main__ import test",
                            number=2**10)
        print("{0}, {1}: {2}".format(trial[0], test.__doc__, trial_time))
        
'''
output:
0% missing keys, try/except access: 0.11592264400678687
0% missing keys, Standard access: 0.2794266320124734
50% missing keys, try/except access: 0.15932855699793436
50% missing keys, Standard access: 0.2333725259959465
100% missing keys, try/except access: 0.14439084999321494
100% missing keys, Standard access: 0.24631450600281823
'''