mmap

mmap_test1.py

#coding: utf-8
import sys
import os
import mmap


def get_mmap(filepath):
    with open(filepath, 'r+b') as f:
        mm = mmap.mmap(f.fileno(), 0)

    return mm


def test(path):
    mm = get_mmap(path)
    a = raw_input('input:')
    print mm.readline()
    mm[:3] = 'new'
    mm.seek(0)
    print mm.readline()
    a = raw_input('input:')
    mm.close()



if __name__ == "__main__":
    path='/tmp/test_mmap.txt'
    with open(path, 'w') as f:
        f.writelines('test test.....')
    test(path)

mmap_test2.py

#coding: utf-8
import sys
import os
import mmap


def get_mmap(filepath):
    with open(filepath, 'r+b') as f:
        mm = mmap.mmap(f.fileno(), 0)

    return mm


def test(path):
    mm = get_mmap(path)
    print mm.readline()
    a = raw_input('wait1:')
    mm.seek(0)
    print mm.readline()
    mm.close()



if __name__ == "__main__":
    path='/tmp/test_mmap.txt'
    test(path)