day18作业

作业：

# 1、编写课上讲解的有参装饰器准备明天默写
def auth(file_type):
    def outer(func):
        def inter(*args,**kwargs):
            if file_type == "file":
                res = func(*args,**kwargs)
                return res
            elif file_type == "mysql":
                res = func(*args,**kwargs)
                return res
        return  inter
    return outer

# 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
op_dict = {}

def add_op(key_dic):
    def outer(func):
        def wrapper(*args,**kwargs):
            op_dict[key_dic] = func,func.__doc__
            res = func(*args,**kwargs)
            return res
        return wrapper
    return outer

@add_op("1")
def withdraw():
    """取款"""
    print("取款")

print(withdraw)

withdraw()
print(op_dict)
# 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 add_log(file_load):
    def outer(func):
        def wrapper(*args,**kwargs):
            start_time = time.strftime('%Y-%m-%d %X')
            msg = f"{start_time} {func} run\n"
            with open(file_load,"a",encoding="utf-8") as f:
                f.write(msg)
            res = func(*args,**kwargs)
            return res
        return wrapper
    return outer

# 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

# 字符串
s = "字符串"
s_iter = s.__iter__()
while True:
    try:
        print(s_iter.__next__())
    except StopIteration:
        break

# 列表
l = [1,2,3,4,4]
l_iter = l.__iter__()
while True:
    try:
        print(l_iter.__next__())
    except StopIteration:
        break

# 元祖
t = ("q","w","e","r","d","f")
t_iter = t.__iter__()
while True:
    try:
        print(t_iter.__next__())
    except StopIteration:
        break

# 字典
d = {"1":1,"2":2}
d_iter = d.__iter__()
while True:
    try:
        print(d_iter.__next__())
    except StopIteration:
        break

# 集合
se = {1,2,3,4}
se_iter = se.__iter__()

while True:
    try:
        print(se_iter.__next__())
    except StopIteration:
        break

# 文件对象

with open("a.txt") as f:
    while True:
        try:
            print(f.__next__())
        except StopIteration:
            break

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

a = range(1,5,3)
print(next(a))
print(next(a))
print(next(a))