python3 day07 练习题
'''
1、new方法和init方法执行的执行顺序?
答:先执行new方法,开辟内存,创建对象,再执行init
'''
# class Person():
# def __init__(self, name, age):
# self.name = name
# self.age = age
# print("我是init方法.")
#
# def __new__(cls, *args, **kwargs):
# print("我是new方法.")
# return object.__new__(cls)
#
# p = Person("lily", 18)
# p2 = Person("lucy", 20)
# print(id(p), id(p2))
'''
2、call方法在什么时候被调用?
答:当对象()的时候被调用
'''
# class Person():
# def __init__(self):
# print("我是init方法.")
#
# def __call__(self):
# print("我是call方法.")
#
# p = Person()
# p()
''''
3、请用写一个类,用反射为这个类添加一个静态属性
'''
# class Person():
# pass
#
# setattr(Person, "age", 30)
# print(Person.age)
'''
4、请用反射为上题的类的对象添加一个属性name,值为你的名字
'''
# class Person():
# pass
#
# p = Person()
# setattr(Person, "age", 30)
# setattr(p, "name", "肖岩岩")
# print(Person.age)
# print(p.name)
'''
5、请使用new方法实现一个单例模式
'''
# class Singleton():
# __instance = None # 保存对象
#
# def __init__(self):
# print("我是init方法.")
#
# def __new__(cls, *args, **kwargs):
# if not Singleton.__instance: # 判断是否不为None
# Singleton.__instance = object.__new__(cls) # 创建对象并更新类变量
# return Singleton.__instance
#
# s = Singleton()
# s1 = Singleton()
# print(id(s), id(s1))
'''
6、校验两个文件的一致性
'''
# import hashlib
#
# def get_file_md5(file):
# """返回文件内容md5加密后的字符串"""
# obj = hashlib.md5()
# obj.update(open(file).read().encode("utf-8"))
# return obj.hexdigest()
#
# if get_file_md5("file1.py") == get_file_md5("file2.py"):
# print("两个文件的内容一致.")
# else:
# print("两个文件的内容不一致.")
'''
7、加盐的密文登陆
'''
# import hashlib
#
# username = ""
# password = ""
#
# class Auth():
# __salt = "谁言寸草心,报得三春晖." # 盐字符串
#
# def get_md5_str(self, str1):
# """md5加密"""
# md5_obj = hashlib.md5(self.__salt.encode("utf-8"))
# md5_obj.update(str1.encode("utf-8"))
# return md5_obj.hexdigest()
#
# def register(self):
# """用户注册"""
# while 1:
# name = input("Register Username: ").strip()
# pwd = input("Register Password: ").strip()
# if name != "" and pwd != "":
# global username, password
# username = name
# password = self.get_md5_str(pwd)
# print("[%s]注册成功" % username)
# return True
# else:
# print("用户名和密码不能为空.")
#
# def login(self):
# """用户登录"""
# while 1:
# name = input("Login Username: ").strip()
# if name == "":
# print("用户名不能为空.")
# continue
# pwd = input("Login Password: ").strip()
# if pwd == "":
# print("密码不能为空.")
# continue
#
# if username == name and password == self.get_md5_str(pwd):
# print("[%s]登录成功." % name)
# return True
# else:
# print("用户名或密码错误.")
# return False
#
#
# auth = Auth() # 创建一个对象
# auth.register() # 注册
# auth.login() # 登录
'''
8、完成一个既可以向文件输出又可以向屏幕输出的日志设置
'''
import logging
from logging import handlers
class Logger(object):
level_relations = {
'debug': logging.DEBUG,
'info': logging.INFO,
'warning': logging.WARNING,
'error': logging.ERROR,
'crit': logging.CRITICAL
}#日志级别关系映射
def __init__(self, filename, level='info', when='D', backCount=3,
fmt='%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s: %(message)s'):
self.logger = logging.getLogger(filename)
format_str = logging.Formatter(fmt) # 设置日志格式
self.logger.setLevel(self.level_relations.get(level)) # 设置日志级别
sh = logging.StreamHandler() # 往屏幕上输出
sh.setFormatter(format_str) # 设置屏幕上显示的格式
# 往文件里写入#指定间隔时间自动生成文件的处理器
th = handlers.TimedRotatingFileHandler(filename=filename, when=when, backupCount=backCount, encoding='utf-8')
th.setFormatter(format_str) # 设置文件里写入的格式
self.logger.addHandler(sh) # 把对象加到logger里
self.logger.addHandler(th)
if __name__ == '__main__':
log = Logger('all.log', level='debug')
log.logger.debug('debug')
log.logger.info('info')
log.logger.warning('警告')
log.logger.error('报错')
log.logger.critical('严重')
Logger('error.log', level='error').logger.error('error')