Home >Backend Development >Python Tutorial >python相似模块用例

python相似模块用例

WBOY
WBOYOriginal
2016-06-10 15:05:391149browse

一:threading VS Thread

众所周知,python是支持多线程的,而且是native的线程,其中threading是对Thread模块做了包装,可以更加方面的被使用,threading模块里面主要对一些线程操作对象化了,创建了Thread的类。

使用线程有两种模式,一种是创建线程要执行的函数,把这个函数传递进Thread对象里,让它来执行,一种是直接从Thread继承,创建一个新的class,把线程执行的代码放到这个新的类里面,用例如下:

①使用Thread来实现多线程

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

import string
import threading 
import time

def threadMain(a):
  global count,mutex
  #获得线程名
  threadname = threading.currentThread().getName()

  for x in xrange(0,int(a)):
    #获得锁
    mutex.acquire()
    count += 1
    #释放锁
    mutex.release()
    print threadname,x,count
    time.sleep()

def main(num):
  global count,mutex
  threads = []
  count = 1
  #创建一个锁
  mutex = threading.Lock()
  #先创建线程对象
  for x in xrange(0,num):
    threads.append(threading.Thread(target = threadMain,args=(10,)))
  for t in threads:
    t.start()
  for t in threads:
    t.join()

if __name__ == "__main__":
  num = 4
  main(num);

②使用threading来实现多线程

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

import threading
import time

class Test(threading.Thread):
  def __init__(self,num):
    threading.Thread.__init__(self):
    self._run_num = num

  def run(self):
    global count,mutex
    threadName = threading.currentThread.getName()
    for x in xrange(0,int(self._run_num)):
      mutex.acquire()
      count += 1
      mutex.release()
      print threadName,x,count
      time.sleep(1)

if __name__ == "__main__":
  global count,mutex
  threads = []
  num = 4
  count = 1
  mutex.threading.Lock()
  for x in xrange(o,num):
    threads.append(Test(10))
  #启动线程
  for t in threads:
    t.start()
  #等待子线程结束
  for t in threads:
    t.join()

二:optparser VS getopt

①使用getopt模块处理Unix模式的命令行选项

getopt模块用于抽出命令行选项和参数,也就是sys.argv,命令行选项使得程序的参数更加灵活,支持短选项模式和长选项模式

例:python scriptname.py –f “hello” –directory-prefix=”/home” –t  --format ‘a'‘b'

getopt函数的格式:getopt.getopt([命令行参数列表],‘短选项',[长选项列表])

其中短选项名后面的带冒号(:)表示该选项必须有附加的参数

长选项名后面有等号(=)表示该选项必须有附加的参数

返回options以及args

options是一个参数选项及其value的元组((‘-f','hello'),(‘-t',''),(‘—format',''),(‘—directory-prefix','/home'))

args是除去有用参数外其他的命令行 输入(‘a',‘b')

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

import sys
import getopt

def Usage():
  print "Usage: %s [-a|-0|-c] [--help|--output] args..."%sys.argv[0]

if __name__ == "__main__":
  try:
    options,args = getopt.getopt(sys.argv[1:],"ao:c",['help',"putput="]):
    print options
    print "\n"
    print args

    for option,arg in options:
      if option in ("-h","--help"):
        Usage()
        sys.exit(1)
      elif option in ('-t','--test'):
        print "for test option"
      else:
        print option,arg
  except getopt.GetoptError:
    print "Getopt Error"
    Usage()
    sys.exit(1)

②optparser模块

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import optparser
def main():
  usage = "Usage: %prog [option] arg1,arg2..."
  parser = OptionParser(usage=usage)
  parser.add_option("-v","--verbose",action="store_true",dest="verbose",default=True,help="make lots of noise [default]")
  parser.add_option("-q","--quiet",action="store_false",dest="verbose",help="be vewwy quiet (I'm hunting wabbits)")
  parser.add_option("-f","--filename",metavar="FILE",help="write output to FILE")
  parser.add_option("-m","--mode",default="intermediate",help="interaction mode: novice, intermediate,or expert [default: %default]")
  (options,args) = parser.parse_args()
  if len(args) != 1:
    parser.error("incorrect number of arguments")
  if options.verbose:
    print "reading %s..." %options.filename 

if __name__ == "__main__":
  main()

以上就是threading VS Thread、optparser VS getopt 的相互比较,希望对大家学习模块有所帮助。

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn