b_cmeth.py

import time


def sub1(s):
    s[:3] == 'abc'
    s[:3] == 'abc'
    s[:3] == 'abc'

    s[:3] == 'abc'
    s[:3] == 'abc'
    s[:3] == 'abc'

    s[:3] == 'abc'
    s[:3] == 'abc'
    s[:3] == 'abc'

    s[:3] == 'abc'
    s[:3] == 'abc'
    s[:3] == 'abc'

    s[:3] == 'abc'
    s[:3] == 'abc'
    s[:3] == 'abc'


def sub2(s):
    s.startswith('abc')
    s.startswith('abc')
    s.startswith('abc')

    s.startswith('abc')
    s.startswith('abc')
    s.startswith('abc')

    s.startswith('abc')
    s.startswith('abc')
    s.startswith('abc')

    s.startswith('abc')
    s.startswith('abc')
    s.startswith('abc')

    s.startswith('abc')
    s.startswith('abc')
    s.startswith('abc')


def test():
    s = 'abcdef'

    t = time.monotonic()
    for _ in range(10**7):
        sub1(s)
    print('s[:3]', time.monotonic() - t)

    t = time.monotonic()
    for _ in range(10**7):
        sub2(s)
    print('s.startswith()', time.monotonic() - t)

test()