程序1: 實現簡單的shell sed替換功能

old = input(‘你要修改原來的內容：‘)
new = input(‘輸入修改後的內容：‘)
with open(‘old‘,‘r‘,encoding=‘utf-8‘) as f,    open(‘new‘,‘a‘,encoding=‘utf-8‘) as f1:#old舊的文件，new新的文件
    for line in f:
        if old in line:
            line = line.replace(old,new)
        f1.write(line)#將替換後的內容寫入新文件

程序2：修改haproxy配置文件

配置文件：

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
 

# Author Cathy
current_index = -1
dict_all = {}
old_content = []
#將backend下的內容找到，並且變成字典的形式
with open("haproxy","r",encoding=‘utf-8‘) as f:
    for index,line in enumerate(f):

        if line.startswith("backend"):#判斷是否是以backend為開頭的
            current_index = index + 1#將下標置為0
            nod = line.strip().split()[1]#
 
將‘backend www.oldboy.org‘轉換成列表，並且刪除前後的空格，以中間空格分成列表,nod為www.oldboy.org
            dict_all["backend"] = nod#生成一個{‘bakend‘: ‘www.oldboy.org‘}字典
        elif index == current_index:
                dict_all["record"] = {}
                dict_all["record"]["server"] = line.strip().split()[1],line.strip().split()[2]
                dict_all["record"]["weight"] = line.strip().split()[4]
                dict_all["record"]["maxconn"] = line.strip().split()[6]
        else:
            old_content.append(line.strip())

    print(‘以下功能可使用：\n1.查詢\n2.修改\n3.刪除\n4.退出\n‘)
    flag = True
    while flag:
        option = int(input(‘請輸入功能編號：‘))
        #查詢

        if option == 1:
            backend_1 = input(‘請輸入你要查詢baclend下的節點：‘)
            for line in dict_all:
                if backend_1 in dict_all[line]:
                    print(dict_all)
                else:
                    continue

        #修改
        elif option == 2:
            backend_2 = input(‘請輸入你要修改baclend下的節點：‘)
            dict_all["backend"]= backend_2
            dict_all["record"] = {}
            dict_all["record"]["server"] = input(‘輸入server：‘)
            dict_all["record"]["weight"] = input(‘輸入weight：‘)
            dict_all["record"]["maxconn"] = input(‘輸入maxconn：‘)

        #刪除
        elif option ==3:
            backend_3 = input(‘請輸入你要刪除baclend下的節點：‘)
            if backend_3 == dict_all[‘backend‘]:
                dict_all= {}
                print("刪除成功！")
            else:
                print("沒有這個節點，重新輸入！")

        elif option == 4:
            for i in old_content:
                f = open("haproxy_new", "a")
                f.write("%s\n"%i)
            if dict_all != {}:
                open("haproxy_new", "a").write("backend %s\n\tserver%s weight %s maxconn %s\n\n" % (
                dict_all["backend"], dict_all["record"]["server"], dict_all["record"]["weight"],
                dict_all["record"]["maxconn"]))
                f.close()
            flag = False

        else:
            pass

day2 文件實例