python 库学习

今天学习了几个pythonku

1. multiprocess

 

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(12))  

 

 

 

import os, time, sys, atexit  
from multiprocessing import *  
  
def test(i):  
    list.append("{0:02} {1}".format(i, current_process().pid))  
    time.sleep(0.01)  
    return i*2  
  
if __name__ == "__main__":  
  
    manager = Manager()  
    list = manager.list()  
  
    pool = Pool(3)  
    ret = pool.map(test, range(10), 3)  
  
    pool.close()  
    pool.join()  
  
    for x in sorted(list): print x  
    print ret  

2. random

 

 

a = random(10)  
random.shuffle(a)  
  
random.uniform(1, 20)  
  
a = Random()  
a.seed(1)  
[a.randint(1,100) for x in range(10)]  
b=Random()  
b.seed(1)  
[b.randint(1, 100) for x in range(10)]  

3.heapq

 

 

from heapq import *  
  
from random import *  
  
rand = sample(range(10), 10) # 生成随机整数列表  
  
heap = []  
for i in rand: heappush(heap, i) # 将随机数压入  
for i in range(len(rand)): heappop(heap) # 从堆弹出整数，总是返回最小值。  
nlargest(3, range(10))  
nsmallest(5, range(10))