作业3月24号

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('your name>>>: ').strip()
            pwd = input('your password>>>: ').strip()

            if db_type == 'file':
                print('基于文件的验证')
                if name == 'egon' and pwd == '123':
                    res = func(*args, **kwargs)  # index(1,2)
                    return res
                else:
                    print('user or password error')
            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')  
def transfer():
    print('transfer')

index(1, 2)
home('egon')
transfer()

 

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

def append2dict(tips):
    def wrapper(func):
        def inner(*args, **kwargs):
            index = len(cmd_dict) + 1
            cmd_dict[str(index)] = (tips, func)
        return inner
    return wrapper


def auto_append():
    my_func = {k: v for k, v in globals().items() if callable(v) if k not in {'append2dict', 'auto_append'}}
    for func in my_func.values():
        func()


@append2dict(tips='登录')
def login():
    print('this is login')


@append2dict('注册')
def register():
    print('this is register')



auto_append()

while 1:
    for k, v in cmd_dict.items():
        print(f'{k}-{v[0]}'.center(20, '-'))

    cmd = input('请输出编号：').strip()
    if cmd not in cmd_dict:
        print('请重新输入')
        continue
    func = cmd_dict.get(cmd)[1]
    func()

 

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')

def info(path):
    def outter(func):
        def wrapper(*args, **kwargs):
            now=time.strftime('%Y-%m-%d %X')
            with open('path','a',encoding='utf-8') as f:
                f.write(now)
            res = func(*args, **kwargs)
            return res
        return wrapper
    return outter
path=input('请输入路径')
@info(path)
def f1():
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

#字符串
st='hello'
res=st.__iter__()
while 1:
    try:
        print(res.__next__())
    except StopIteration:
        break
#列表
lis=[1,2,3,4]
res=lis.__iter__()
while 1:
    try:
        print(res.__next__())
    except StopIteration:
        break
#元组
tup=(1,2,3,4)
res=tup.__iter__()
while 1:
    try:
        print(res.__next__())
    except StopIteration:
        break
#字典
dic={'a':1,'b':2}
res=dic.__iter__()
while 1:
    try:
        print(res.__next__())
    except StopIteration:
        break
#集合
se=(1,2,[3,4,])
res=se.__iter__()
while 1:
    try:
        print(res.__next__())
    except StopIteration:
        break
#文件对象
with open('a.txt','w',encoding='utf-8') as f1:
    while 1:
        try:
            print(f1.__next__())
        except StopIteration:
            break

 

5、自定义迭代器实现range功能

def my_range(start,stop,step):
    while start < stop:
        yield start
        start+=step
g=my_range(1,9,1)

for n in g:
    print(n)