Q.yuhen

Server A: 192.168.1.10 (主服务器)
Server B: 192.168.1.20
Virtual IP: 192.168.1.100

$ sudo apt-get install keepalived

In [1]: from itertools import *

In [3]: it = count(2)

In [4]: [it.next() for i in range(10)]
Out[4]: [2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

... ...

In [5]: it = cycle("abc")

In [6]: [it.next() for i in range(10)]

In [1]: from heapq import *

In [2]: from random import *

In [3]: rand = sample(range(10), 10) # 生成随机整数列表

In [4]: rand
Out[4]: [9, 2, 8, 5, 3, 6, 4, 1, 0, 7]

In [5]: heap = []

In [6]: for i in rand: heappush(heap, i) # 将随机数压入堆

In [1]: from random import *

In [2]: a = Random(); a.seed(1)

In [3]: [a.randint(1, 100) for i in range(20)]
Out[3]: [14, 85, 77, 26, 50, 45, 66, 79, 10, 3, 84, 44, 77, 1, 45, 73, 23, 95, 91, 4]

In [4]: b = Random(); b.seed(1)

In [5]: [b.randint(1, 100) for i in range(20)]
Out[5]: [14, 85, 77, 26, 50, 45, 66, 79, 

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import os, time, sys, atexit
from multiprocessing import *

def test(i):
    print current_process().pid, i
    time.sleep(0.01)
    return i * 2

if __name__ == "__main__":

    pool = Pool(3)

    for i in range(5):
        # 处理单个任务
        ret = pool.apply(test, [i])
        print "apply return:", ret

    # 处理多个任务
    pool.map(test, range(10))

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import os, time, sys, atexit
from multiprocessing import *

def test(event, value, array):
    event.wait()
    print "child:", value.value, array.value

    value.value = 200
    array.value = "Hi!"

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import os, time
from multiprocessing import *

def test(conn):
    print conn.recv()
    conn.send("child: Pipe!")

if __name__ == "__main__":

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import os, time
from multiprocessing import *

def test(x):
    print current_process().pid, x
    time.sleep(1)

if __name__ == "__main__":
    print "main:", os.getpid()
    p = Pool(5)
    p.map(test, range(13))

$ ./test.py

main: 1208
1209 0
1210 1
1211 2