python基础篇第十一节课

查询功能和修改功能

import os
def fetch(data):
    print("这是查询功能")
    print("用户数据是",data)
    backend_data = "backend %s" %data
    with open("test.conf","r",encoding="utf_8")as read_f:
        tag = False
        ret = []
        for read_line in read_f:
            if read_line.strip()== backend_data:
                tag = True
                continue
            if tag and read_line.startswith("backend"):
                break
            if tag:
                print("%s" %read_line,end="")
                ret.append(read_line)
    return ret

def add():
    pass

def change(data):
    print("这是修改功能")
    print("用户输入的数据是",data)
    backend = data[0]["backend"]
    backend_data="backend %s" %backend
    old_server_record = "%sserver %s %s weight %s maxconn %s\n" %(" "*8,data[0]["record"]["server"],
                                                                   data[0]["record"]["server"],
                                                                   data[0]["record"]["weight"],
                                                                   data[0]["record"]["maxconn"])
    new_server_record = "%sserver %s %s weight %s maxconn %s\n" %(" "*8,data[1]["record"]["server"],
                                                                   data[1]["record"]["server"],
                                                                   data[1]["record"]["weight"],
                                                                   data[1]["record"]["maxconn"])
    print("想要修改的数据是", old_server_record)
    res = fetch(backend)
    print("来自change的函数", res)
    if not res or old_server_record not in res:
        return "修改的记录不存在"
    else:
        index = res.index(old_server_record)
        res[index] = new_server_record
    res.insert(0,"%s\n"%backend_data)
    with open("test.conf","r")as read_f,open("test.conf_new","w")as write_f:
        tag = False
        for read_line in read_f:
            if read_line.strip()==backend_data:
                tag=True
                continue

            if tag and read_line.startswith("backend"):
                tag=False
            if not tag:
                write_f.write(read_line)
            else:
                if not has_write:
                    for record in res:
                        write_f.write(record)
                    has_write =True
    os.rename("test.conf","test.conf_bak")
    os.rename("test.conf_new","test.conf")
    os.remove("test.conf_bak")


def delete():
    pass

if __name__ =="__main__":
    msg = '''
    1:查询
    2:添加 
    3:修改 
    4:删除 
    5:退出
    '''
    msg_dic = {"1":fetch,"2":add,"3":change,"4":delete,"5":quit}

while True:
    print(msg)
    choice = input("请输入您的选项：").strip()
    if not choice:continue
    if choice == 5:break

    data =input("请输入您的数据：").strip()

    if choice!="1":
        data=eval(data)

    res = msg_dic[choice](data)
    print("最终结果是",res)
 
# [{"backend":"www.oldboy1.org","record":{"server":"2.2.2.4","weight":20,"maxconn":3000}},{"backend":"www.oldboy1.org","record":{"server":"2.2.2.8","weight":30,"maxconn":4000}}]

 

模块

　　作用：1执行对应文件

　　　　　2引入变量名

 　　from 文件夹 import文件 

　　多重包

　　from 包.包 import 文件

时间模块

　　

#结构化时间 ——————当地时间
import time
print(time.localtime())    #年份日期
t=time.localtime()
print(t.tm_year)        #年份
print(t.tm_hour)        #小时
print(t.tm_mon)         #月份
print(t.tm_mday)        #日期
print(t.tm_wday)        #一周第几天（从星期日开始算0,1,2,3,4,5,6）
print(t.tm_min)         #分钟
print(t.tm_sec)         #秒数
print(t.tm_yday)        #一年中多少天


#结构化时间——————utc
print(time.gmtime())

#将结构化时间转换为时间戳
print(time.mktime(time.localtime()))

#将结构化时间转换为字符串时间
print(time.strtime("%Y--%m-%d %X",time.localtime()))            #年 月 日 时分秒

#将字符串时间转换为结构化时间
print(time.strftime("2018:9:27:22:42:50","%Y:%m:%d:%X"))

import datetime
print(datetime.datetime.now())

随机模块

# 浮点型
import random
ret = random.random()
print(ret)

#整点型
ret =random.randint(1,5)
print(ret)      #输出1-5之间的任意数
ret=random.randrange(1,5)
print(ret)      #输出1-4之间的任意数
ret=random.choice([11,22])
print(ret)      #输出11,22,33之间任意一组数
ret=random.sample([11,22,33,44,55],2)
print(ret)      #输出其中任意两组数
ret=random.uniform(1,4)
print(ret)      #输出1-4之间的浮点数

ret=[1,2,3,4,5]
random.shuffle(ret)
print(ret)      #打乱列表中的排序

#随机验证码
def v_code():
    ret =" "
    for i in range(5):
        num = random.randint(0,9)
        alf = chr(random.randint(65,122))
        s = str(random.choice([num,alf]))
        ret +=s
    return  ret
print(v_code())