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要求：给定一个列表 [13,22,6,99,11] 通过程序实现让他们可以从小到大排序。
思路：让相邻的两个数互比大小，存在大数就放在右边。
我的实现：
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘lilon‘ li = [33,11,88,77,44,345,223,113,555,23,3] print li print "**************************8" #定义冒泡函数，计算排序，最大数放在右面 def maopao(): #循环，从1开始，例如range(1,5) 1,2,3,4 注意没有5 for n in range (1,len(li)): #循环，从0开始到 例如range(5-1 4) range(5-2 3) range(5-3 2) range(5-4 1) for m in range(len(li)-n): #给num1赋值 li[m] num1 = li[m] #给num2赋值 li[m+1] num2 = li[m+1] #比较num1 num2 if num1 > num2: #通过临时变量temp交换li[m] 和 li[m+1] temp = num1 li[m] = num2 li[m+1] = temp print li print li pass #定义一个主函数 def main(): maopao() #限制程序入口 if __name__ =="__main__": main()
默认配置
global log 127.0.0.1 local2 daemon maxconn 256 log 127.0.0.1 local2 info defaults log global mode http timeout connect 5000ms timeout client 50000ms timeout server 50000ms option dontlognull listen stats :8888 stats enable stats uri /admin stats auth admin:1234 frontend oldboy.org bind 0.0.0.0:80 option httplog option httpclose option forwardfor log global acl www hdr_reg(host) -i www.oldboy.org use_backend www.oldboy.org if www backend www.oldboy.org server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000 原配置文件
修改需求
1、查 输入：www.oldboy.org 获取当前backend下的所有记录 2、新建 输入： arg = { ‘bakend‘: ‘www.oldboy.org‘, ‘record‘:{ ‘server‘: ‘100.1.7.9‘, ‘weight‘: 20, ‘maxconn‘: 30 } } 3、删除 输入： arg = { ‘bakend‘: ‘www.oldboy.org‘, ‘record‘:{ ‘server‘: ‘100.1.7.9‘, ‘weight‘: 20, ‘maxconn‘: 30 } } 需求
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘lilon‘ import os import json #定义好一个函数，用来做查找 def fetch(ha): backendlist = ha #先准备一个列表，在后面用来加入查到的backend字段下的server信息 serverinfo = [] # print "backend %s" %backendlist #使用with的方式打开文件，可以自动的关闭文件，减少我们出错误的可能 with open ("oldboy.conf","r")as obj: """ #灵活添加flag，使用flag做一个开关，匹配到了相关的backend就把flag设置为True， 直到遇到了backend开头的其他的字段，就把flag设置为False， 中间的就是我们需要的信息，使用列表的append()方法就可以添加了 """ flag = False #循环，一次一行，处理大文件必须的方式 for line in obj: if line.strip() == "backend %s" % backendlist: flag = True continue #灵活性代码 startswitch方法 匹配开头是backend的行 if flag and line.strip().startswith("backend"): flag = False break """ #当我们确认了flag是True， 意味着上面已经找到了相关的backend， 而且把flag设置为了True了， 所以我们现在可以通过append()方法来把相关的server info 加入到了列表里面 """ if flag and line.strip(): serverinfo.append(line.strip()) if serverinfo: return serverinfo #定义一个函数，做增加 def backendadd(**dict_info): fetch_list = [] backend_title = dict_info.get("backend") current_record_pre = "server {server} weight {weight} maxconn {maxconn}" current_record = current_record_pre.format(**dict_info.get("record")) fetch_list = fetch(backend_title) if fetch_list: if current_record in fetch_list: pass else: fetch_list.append(current_record) with open("oldboy.conf","r") as objConf, open("conf.temp","w") as objTemp: flag = False isWrite = True for line in objConf: if line.strip() == "backend %s" %backend_title: objTemp.write(line) flag = True continue if flag == True and line.strip().startswith("backend"): flag = False if flag == True: if isWrite: for new_line in fetch_list: temp = "%s%s\n" %(" "*8,new_line) objTemp.write(temp) isWrite = True else: objTemp.write(line) if os.path.isfile("oldboy.bak"): os.remove("oldboy.bak") os.rename("oldboy.conf","oldboy.bak") os.rename("conf.temp","oldboy.conf") return True else: with open("oldboy.conf","r") as objConf, open("conf.temp","w") as objTemp: for line in objConf: objTemp.write(line) objTemp.write("backend %s\n" %backend_title) objTemp.write("%s%s\n" %(" "*8,current_record)) if os.path.isfile("oldboy.bak"): os.remove("oldboy.bak") os.rename("oldboy.conf","oldboy.bak") os.rename("conf.temp","oldboy.conf") return True def delitem(**dict_info): fetch_list = [] backend_title = dict_info.get("backend") current_record_pre = "server {server} weight {weight} maxconn {maxconn}" current_record = current_record_pre.format(**dict_info.get("record")) fetch_list = fetch(backend_title) if fetch_list: if current_record in fetch_list: with open("oldboy.conf","r") as objConf, open("conf.temp","w") as objTemp: if len(fetch_list) > 1: for line in objConf: if line.strip() == current_record: continue else: objTemp.write(line) else: for line in objConf: if line.strip() == "backend %s" %backend_title: continue if line.strip() == current_record: continue else: objTemp.write(line) if os.path.isfile("oldboy.bak"): os.remove("oldboy.bak") os.rename("oldboy.conf","oldboy.bak") os.rename("conf.temp","oldboy.conf") return True else: pass else: pass pass def backup(): os.remove("oldboy.conf") os.rename("oldboy.bak","oldboy.conf") #定义一个主函数 def main(): ha = "buy.oldboy.org" dictItem = { ‘backend‘: ‘buy.oldboy.org‘, ‘record‘:{ ‘server‘: ‘101.1.71.90 100.1.7.90‘, ‘weight‘: 22, ‘maxconn‘: 3000 } } userInput = int(raw_input("hi plese input your choice:\n 1.search \n 2.add \n 3.del \n")) if userInput == 1: print "you select search." # userInputSearch = raw_input("input a backend url") searchEnd = fetch(ha) if searchEnd: for line in searchEnd: print line print "search End!" else: print "sorry not found!" elif userInput == 2: print "you select add." addEnd = backendadd(**dictItem) if addEnd: print "add successful" else: print "error!!!" elif userInput == 3: print "you select del." delEnd = delitem(**dictItem) if delEnd: print "del successful" else: print "no file in their" if os.path.isfile("oldboy.temp.conf"): os.remove("oldboy.temp.conf") elif userInput == 4: print "this is a super command" backup() else: print "sorry, i can not do that!!!" #限制程序入口 if __name__ =="__main__": main()
学习条件运算时，对于简单的 if else 语句，可以使用三元运算来表示，即：
# 普通条件语句 if 1 == 1: name = ‘wupeiqi‘ else: name = ‘alex‘ # 三元运算 name = ‘wupeiqi‘ if 1 == 1 else ‘alex‘
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘EchoRep‘ def func1(arg): return arg + 1 func2 = lambda a: a+1 func3 = lambda a,b: a+b def lambdax(): result = func1(100) print result result2 = func2(1000) print result2 result3 = func3(100,211) print result3 #定义一个主函数 def main(): lambdax() pass #限制程序入口 if __name__ == "__main__": main()
遍历序列，对序列中每个元素进行操作，最终获取新的序列
li = [11, 22, 33] new_list = map(lambda a: a + 100, li)
li = [11, 22, 33] sl = [1, 2, 3] new_list = map(lambda a, b: a + b, li, sl)
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘EchoRep‘ def func1(args): return args ** 128 #定义一个主函数 def main(): li =[2,3,4] l1 = [1,2,3] l2 = [2,3,4] l3 = [3,4,5] print map(lambda a,b,c:a+b+c,l1,l2,l3) pass #限制程序入口 if __name__ == "__main__": main()
对于序列中的元素进行筛选，最终获取符合条件的序列
li = [11, 22, 33] new_list = filter(lambda arg: arg > 22, li) #filter第一个参数为空，将获取原来序列
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘EchoRep‘ li = [11,22,33,44] #定义一个主函数 def main(): print filter(lambda a:a>33,li) pass #限制程序入口 if __name__ == "__main__": main()
用于累计操作，如累加，累乘等
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘EchoRep‘ li = [1,2,3,4,5,6,7,8,9] #定义一个主函数 def main(): print reduce(lambda arg1,arg2:arg1*arg2,li) #限制程序入口 if __name__ == "__main__": main()
暂时跳出了函数，但是下次可以继续使用，和continue要区分开
#!/usr/bin/env python # -*- coding: utf-8 -*- __author__ = ‘EchoRep‘ def func1(): yield 1 yield 2 yield 3 def mrange(arg): seed = 0 while True: seed = seed + 1 if seed > arg: return else: yield seed #定义一个主函数 def main(): for i in mrange(10): print i #限制程序入口 if __name__ == "__main__": main()
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原文地址：http://www.cnblogs.com/echorep/p/4982694.html
