3.24作业

# 1、编写课上讲解的有参装饰器准备明天默写
def auth(db_type):
    def deco(func):
        def wrapper(*args, **kwargs):
            name = input('请输入名字: ').strip()
            pwd = input('请输入密码: ').strip()
            if db_type == 'file':
                if name == 'egon' and pwd == '123':
                    res = func(*args, **kwargs)
                    return res
                else:
                    print('账号或密码错误')
            elif db_type == 'mysql':
                print('基于mysql的验证')
            elif db_type == 'ldap':
                print('基于ldap的验证')
            else:
                print('不支持该db_type')

        return wrapper

    return deco

@auth(db_type='file')
def index(x, y):
    print('index->>%s:%s' % (x, y))

@auth(db_type='mysql')
def home(name):
    print('home->>%s' % name)


@auth(db_type='ldap')  # 账号密码的来源是ldap
def transfer():
    print('transfer')


# index(1,2)
# home(111)

# 2：还记得我们用函数对象的概念，制作一个函数字典的操作吗，来来来，我们有更高大上的做法，在文件开头声明
# 一个空字典，然后在每个函数前加上装饰器，完成自动添加到字典的操作
dic={}
k=0
def add(key,value):
    def outter(func):
        def wrapper(*args,**kwargs):
            res=func(*args,**kwargs)
            dic[key]=value
            return  res
        return wrapper
    return outter

@add(1,2)
def index():
    pass

# print(index())
# print(dic)
# 3、 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
# 注意：时间格式的获取
# import time
# time.strftime('%Y-%m-%d %X')


import time
def log(func):
    def wrapper(*args,**kwargs):
        res=func(*args,**kwargs)
        with open('log.txt','a',encoding='utf-8')as f:
            f.write(f'2017-07-21 11:12:11 f1 run')
        return res
    return wrapper

@log
def f1():
    pass

# f1()

# 4、基于迭代器的方式，用while循环迭代取值字符串、列表、元组、字典、集合、文件对象
# str="abcde"
# str_iterator=iter(str)
# while 1:
#     try:
#         print(next(str_iterator))
#     except StopIteration:
#         break


# l=[1,2,3]
# l_iterator=iter(l)
# while 1:
#     try:
#         print(next(l_iterator))
#     except StopIteration:
#         break


# t=(11,22,33)
# t_iterator=iter(t)
# while 1:
#     try:
#         print(next(t_iterator))
#     except StopIteration:
#         break



# dic={'a':1,'b':2}
# dic_iterator=iter(dic)
# while 1:
#     try:
#         print(next(dic_iterator))
#     except StopIteration:
#         break

# set1={1,2,3}
# set1_iterator=iter(set1)
# while 1:
#     try:
#         print(next(set1_iterator))
#     except StopIteration:
#         break


with open('log.txt','r',encoding='utf-8')as f:
    for line in f:
        f_iterator=iter(line)
while 1:
    try:
        print(next(f_iterator))
    except StopIteration:
        break



# 5、自定义迭代器实现range功能
def my_range(start,stop,step=1):
    while start < stop:
        yield start
        start+=step

for i in my_range(1,5):
    print(i)