import timeit
import fileinput

def fileread1():
    file = open("test.txt")
    while 1:
        line = file.readlines()
        if not line:
            break
        pass
    file.close()

def fileread2():
    for l in fileinput.input("test.txt"):
        pass

def fileread3():
    file = open("test.txt")
    for l in file:
        pass

t1 = timeit.Timer(setup='from __main__ import fileread1', stmt='fileread1()')
t2 = timeit.Timer(setup='from __main__ import fileread2', stmt='fileread2()')
t3 = timeit.Timer(setup='from __main__ import fileread3', stmt='fileread3()')

num_lines = 1000000
num_runs = 20
time = t1.timeit(number=num_runs)/num_runs
print "%s sec\t%d lines/sec" % (time, int(num_lines / time))
time = t2.timeit(number=num_runs)/num_runs
print "%s sec\t%d lines/sec" % (time, int(num_lines / time))
time = t3.timeit(number=num_runs)/num_runs
print "%s sec\t%d lines/sec" % (time, int(num_lines / time))