with open as f 已经从内部处理难点，使用 for line in f 以迭代器的形式每次读取一行，不会有内存问题。
下面程序的思路是用一个列表存放读取到的数据，达到长度后就开始处理，处理完就清空列表，继续执行
背景：Python脚本：读取文件中每行，放入列表中；循环读取列表中的每个元素，并做处理操作。核心：多线程处理单个for循环函数调用
模块：threading
第一部分：
：多线程脚本 (该脚本只有两个线程，t1循环次数<t2)
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#!/usr/bin/env python#-*- coding: utf8 -*- import sysimport timeimport stringimport threadingimport datetimefileinfo = sys.argv[1] # 读取文件内容放入列表host_list = []port_list = [] # 定义函数：读取文件内容放入列表中def CreateList():f = file(fileinfo,'r')for line in f.readlines():host_list.append(line.split(' ')[0])port_list.append(line.split(' ')[1])return host_listreturn port_listf.close() # 单线程 循环函数，注释掉了#def CreateInfo(): #for i in range(0,len(host_list)): # 单线程：直接循环列表#time.sleep(1)#TimeMark = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')#print "The Server's HostName is %-15s and Port is %-4d !!! [%s]" % (host_list[i],int(port_list[i]),TimeMark)# # 定义多线程循环调用函数def MainRange(start,stop): #提供列表index起始位置参数for i in range(start,stop):time.sleep(1)TimeMark = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')print "The Server's HostName is %-15s and Port is %-4d !!! [%s]" % (host_list[i],int(port_list[i]),TimeMark) # 执行函数，生成列表CreateList()# 列表分割成：两部分 mid为列表的index中间位置mid = int(len(host_list)/2) # 多线程部分threads = []t1 = threading.Thread(target=MainRange,args=(0,mid))threads.append(t1)t2 = threading.Thread(target=MainRange,args=(mid,len(host_list)))threads.append(t2) for t in threads:t.setDaemon(True)t.start()t.join()print "ok"
以上是脚本内容！！！
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：读取文件的内容
文件内容：
[root@monitor2 logdb]# cat hostinfo.txt
192.168.10.11 1011
192.168.10.12 1012
192.168.10.13 1013
192.168.10.14 1014
192.168.10.15 1015
192.168.10.16 1016
192.168.10.17 1017
192.168.10.18 1018
192.168.10.19 1019
192.168.10.20 1020
192.168.10.21 1021
192.168.10.22 1022
192.168.10.23 1023
192.168.10.24 1024
192.168.10.25 1025
：输出结果：
单线程 : 执行脚本：输出结果：
[root@monitor2 logdb]# ./Threadfor.py hostinfo.txt
The Server's HostName is 192.168.10.10 and Port is 1010 !!! [2017-01-10 14:25:14]
The Server's HostName is 192.168.10.11 and Port is 1011 !!! [2017-01-10 14:25:15]
The Server's HostName is 192.168.10.12 and Port is 1012 !!! [2017-01-10 14:25:16]
.
.
.
The Server's HostName is 192.168.10.25 and Port is 1025 !!! [2017-01-10 14:25:29]
多线程：执行脚本：输出 结果
[root@monitor2 logdb]# ./Threadfor.py hostinfo.txt
The Server's HostName is 192.168.10.11 and Port is 1011 !!! [2017-01-10 14:51:51]
The Server's HostName is 192.168.10.18 and Port is 1018 !!! [2017-01-10 14:51:51]
The Server's HostName is 192.168.10.12 and Port is 1012 !!! [2017-01-10 14:51:52]
The Server's HostName is 192.168.10.19 and Port is 1019 !!! [2017-01-10 14:51:52]
The Server's HostName is 192.168.10.13 and Port is 1013 !!! [2017-01-10 14:51:53]
The Server's HostName is 192.168.10.20 and Port is 1020 !!! [2017-01-10 14:51:53]
The Server's HostName is 192.168.10.14 and Port is 1014 !!! [2017-01-10 14:51:54]
The Server's HostName is 192.168.10.21 and Port is 1021 !!! [2017-01-10 14:51:54]
The Server's HostName is 192.168.10.15 and Port is 1015 !!! [2017-01-10 14:51:55]
The Server's HostName is 192.168.10.22 and Port is 1022 !!! [2017-01-10 14:51:55]
The Server's HostName is 192.168.10.16 and Port is 1016 !!! [2017-01-10 14:51:56]
The Server's HostName is 192.168.10.23 and Port is 1023 !!! [2017-01-10 14:51:56]
The Server's HostName is 192.168.10.17 and Port is 1017 !!! [2017-01-10 14:51:57]
The Server's HostName is 192.168.10.24 and Port is 1024 !!! [2017-01-10 14:51:57]
The Server's HostName is 192.168.10.25 and Port is 1025 !!! [2017-01-10 14:51:58]
