calss BaseMessage(object):def send(self,x):#必须继承BaseMessage,然后其中必须编写send方法.用于具体业务逻辑.raise NotImplementedError(".send() 必须被重写")
class Email(BaseMessage):def  send(self,x):#必须继承BaseMessage,然后其中必须编写send方法,用于完成具体逻辑return x
obj = Email()
obj,send(1)

from abc import ABCMeta,abstractmethodclass Base(metaclass=ABCMeta):  # 定义抽象类def f1(self):print('酸辣')@abstractmethoddef f2(self):     #抽象方法pass
class Foo(Base):def f2(self):print('帅')obj = Foo()
obj.f1()

import os
class ExistsError(Exception):pass
class KeyInvalidError(Exception):pass
def new_func(path,prev):response = {'code':1000,'data':None}try:if not os.path.exists():raise ExistsError()if not prev:raise KeyInvalidError()passexcept ExistsError as e:response['code'] = 1001response['data'] = '文件不存在'except KeyInvalidError as e:response['code'] = 1002response['data'] = '关键字为空'except Exception as e:response['code'] =1003response['data'] = '未知错误'return response
print(new_func("C:\刘清扬\PyCharm 2018.1.4\python.py","we"))

class MyException(Exception):def __init__(self,code,msg):self.code = codeself.msg = msg
try:raise MyException(100,'操作异常')except KeyError as obj:print(obj,1111)
except MyException as obj:print(obj,222)                  #打印(100,'操作异常') 222
except Exception as obj:print(obj,3333)

import hashlibdef md5(pwd):obj = hashlib.md5()      obj.update(pwd.encode('utf-8'))return obj.hexdigest()
print(md5('21312e'))    #打印d09c5c2fd74e97e2e9e98bbc8d0a3e4b

import hashlib
Salt = b'qwqw1212'    #加严
def md5(pwd):obj = hashlib.md5(Salt)obj.update(pwd.encode('utf-8'))return obj.hexdigest()
print(md5('21312e'))   打印81dda1ec99f8327b68659dbc56ee46c5

import logging
logger1 = logging.basicConfig(filename='x1.txt',format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',datefmt='%Y-%m-%d %H:%M:%S',level=30)  #当level大于等于30时,会被录入日志
logging.error('x4')
logging.error('x5')

import logging
# 创建一个操作日志的对象logger（依赖FileHandler）
file_handler = logging.FileHandler('l1.log', 'a', encoding='utf-8')
file_handler.setFormatter(logging.Formatter(fmt="%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s"))logger1 = logging.Logger('s1', level=logging.ERROR)
logger1.addHandler(file_handler)
logger1.error('123123123')# 在创建一个操作日志的对象logger（依赖FileHandler）
file_handler2 = logging.FileHandler('l2.log', 'a', encoding='utf-8')
file_handler2.setFormatter(logging.Formatter(fmt="%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s"))logger2 = logging.Logger('s2', level=logging.ERROR)
logger2.addHandler(file_handler2)logger2.error('666')