testReadFile.py

import time
import os

repeat = 10000



notExistingPath = u"test-non-existing.txt"
existingPath = 'test-exsisting.txt'

f = open(existingPath, "w")
f.write("hello world")
f.close()

def test(info, paths):
    print(info)
    t = time.time()
    for i in range(repeat):
        for path in paths:
            if not os.path.exists(path):
                continue
            file = open(path)
            file.read()
    r = time.time() - t
    print(r)

    t = time.time()
    for i in range(repeat):
        for path in paths:
            try:
                with open(path) as file:
                    file.read()
            except IOError:
                continue
    r = time.time() - t
    print(r)
    print()


test("non exists", [notExistingPath, notExistingPath])

test("mixed", [notExistingPath, existingPath])

test("all exists", [existingPath, existingPath])

os.remove(existingPath)