python基础之函数及装饰器作业

用函数生成随机时间

def randtime(a,b):
    start=time.mktime(a)
    end=time.mktime(b)
    t=random.randint(start,end)
    return time.strftime("%Y-%M-%d %H:%m:%S",time.localtime(t))

a=(1976,1,1,0,0,0,0,0,0)
b=(2099,12,31,23,59,59,0,0,0)
rtime=randtime(a,b)
print(rtime)

编写装饰器，为函数加上统计时间的功能

def outer(func):
    def inter(*args, **kwargs):
        stime = time.time()
        res = func(*args, **kwargs)
        etime = time.time()
        dtime = etime - stime
        print("函数执行耗时：{}".format(dtime))
        return res

    return inter

@outer
def func1():
    print("start...")
    time.sleep(1)
    print("end...")

func1()

编写装饰器，为函数加上认证的功能

def auth(func):
    def inter(*args, **kwargs):
        db = [["admin", 123], ["test", 222]]
        sum = 0
        tag = True
        while tag:
            if sum == 3:
                print("连续三次输错密码，程序退出...")
                return
            user_name = input("请输入用户名：").strip()
            pasword = input("请输入密码：").strip()
            for i in db:
                if user_name == i[0] and pasword == str(i[1]):
                    print("认证成功")
                    tag = False
                    break
            else:
                print("认证失败，请重新输入")
                sum += 1
        res = func(*args, **kwargs)
        return res

    return inter

@auth
def func1():
    print("start...")
    time.sleep(1)
    print("end...")

func1()

编写装饰器，为多个函数加上认证的功能（用户的账号密码来源于文件），要求登录成功一次，后续的函
数都无需再输入用户名和密码

is_login = False

def get_db():
    data = {}
    with open("db.txt","rt",encoding="utf-8") as f:
        data=eval(f.read())

    return data

def auth(func):
    def inter(*args, **kwargs):
        global is_login
        if not is_login:
            db = get_db()
            tag = True
            while tag:
                user_name = input("请输入用户名或按b退出：").strip()
                pasword = input("请输入密码：").strip()
                if user_name == "b":
                    return
                if user_name == db["name"] and pasword == db["password"]:
                    print("认证成功")
                    is_login = True
                    tag = False
                    break
                else:
                    print("认证失败，请重新输入")
        res = func(*args, **kwargs)
        return res

    return inter

@auth
def func1():
    print("func1 start...")
    time.sleep(1)
    print("end...")

@auth
def func2():
    print("func2 start...")
    time.sleep(1)
    print("end...")

while True:
    print("""
    1 函数1
    2 函数2
    """)
    a = input("请输入指令或按b退出：").strip()
    if a=="1":
        func1()
    elif a == "2":
        func2()
    elif a =="b":
        break
    else:
        print("指令错误")

编写装饰器，为多个函数加上认证功能，要求登录成功一次，在超时时间内无需重复登录，超过了超时时
间，则必须重新登录

a = datetime.datetime.now()
is_login = [False, a]

def get_db():
    data = {}
    with open("db.txt", "rt", encoding="utf-8") as f:
        data = eval(f.read())

    return data

def auth(func):
    def inter(*args, **kwargs):
        global is_login
        login_time = is_login[1]
        now_time = datetime.datetime.now()
        diff_time = int((login_time - now_time).total_seconds())
        if not is_login[0] and diff_time <= 0:
            db = get_db()
            tag = True
            while tag:
                user_name = input("请输入用户名或按b退出：").strip()
                pasword = input("请输入密码：").strip()
                if user_name == "b":
                    return
                if user_name == db["name"] and pasword == db["password"]:
                    print("认证成功,60秒有效")
                    is_login[1] = login_time + datetime.timedelta(seconds=60)
                    tag = False
                    break
                else:
                    print("认证失败，请重新输入")
        res = func(*args, **kwargs)
        return res

    return inter

@auth
def func1():
    print("func1 start...")
    time.sleep(1)
    print("end...")

@auth
def func2():
    print("func2 start...")
    time.sleep(1)
    print("end...")

while True:
    print("""
    1 函数1
    2 函数2
    """)
    a = input("请输入指令或按b退出：").strip()
    if a == "1":
        func1()
    elif a == "2":
        func2()
    elif a == "b":
        break
    else:
        print("指令错误")

编写日志装饰器，实现功能如：一旦函数 f1 执行，则将消息 2017-07-21 11:12:11 f1 run 写入到日
志文件中，日志文件路径可以指定

def f1():
    with open("log.txt","at",encoding="utf-8") as f:
        for i in range(20):
            strs = "{time} run\n".format(time=time.strftime('%Y-%m-%d %X'))
            f.write(strs)

f1()

编写下载网页内容的函数，要求功能是：用户传入一个 url，函数返回下载页面的结果

def save(url):
    filename = "{name}.html".format(name=url.replace("/", "").replace(".", "").replace(":", ""))
    with open(filename, "wb") as f:
        f.write(get_url(url))

url = input("请输入网址:").strip()
if len(url) < 10:
    print("长度不正确")
else:
    save(url)