函数练习题

练习题

一：编写3个函数，每个函数执行的时间是不一样的，

提示：可以使用time.sleep(2)，让程序sleep 2s或更多，

import time
def test1():
    time.sleep(1)
    print("test1")

def test2():
    time.sleep(2)
    print("test2")

def test3():
    time.sleep(3)
    print("test3")

test1()
test2()
test3()

二：编写装饰器，为每个函数加上统计运行时间的功能

提示：在函数开始执行时加上start=time.time()就可纪录当前执行的时间戳，函数执行结束后在time.time() - start就可以拿到执行所用时间

import time
def outer(func):
    def timmer():
        start = time.time()
        func()
        stop = time.time()
        take = stop-start
        print("time is %s" %take)
    return timmer


@outer
def test1():
    time.sleep(1)
    print("test1")

@outer
def test2():
    time.sleep(2)
    print("test2")

@outer
def test3():
    time.sleep(3)
    print("test3")

test1()
test2()
test3()

　　

三：编写装饰器，为函数加上认证的功能，即要求认证成功后才能执行函数

import time
name = "nico"
passwd = "123"
def outer(func):
    def timmer():
        u_name = input("username:")
        password = input("password:")
        if u_name == name and password == passwd:
            start = time.time()
            func()
            stop = time.time()
            take = stop-start
            print("time is %s" %take)
        else:
            print("wrong")
    return timmer


@outer
def test1():
    time.sleep(1)
    print("test1")

@outer
def test2():
    time.sleep(2)
    print("test2")

@outer
def test3():
    time.sleep(3)
    print("test3")

test1()
test2()
test3()

四：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

提示：从文件中读出字符串形式的字典，可以用eval('{"name":"egon","password":"123"}')转成字典格式

import time
flag = False
def login(name,passwd):
    f = open("装饰器练习1","r",encoding="utf-8")
    data = f.readlines()
    for i in data:
        i.strip()
    msg = eval(i)
    if name == msg["name"] and passwd == msg["password"]:
        global flag
        flag = True

def outer(func):
    def timmer():
        if not flag:
            name = input("username:")
            passw = input("password:")
            login(name,passw)
        if flag:
            start = time.time()
            func()
            stop = time.time()
            take = stop-start
            print("time is %s" %take)
        else:
            print("wrong")
    return timmer


@outer
def test1():
    time.sleep(1)
    print("test1")

@outer
def test2():
    time.sleep(2)
    print("test2")

@outer
def test3():
    time.sleep(3)
    print("test3")

test1()
test2()
test3()