day9-Python学习笔记（二十）数据库备份，修改父类的方法

数据库备份，修改父类的方法

import os,datetime
class BakDb(object):
   def __init__(self,ip,username,passwd,port=3306,path='/tmp/db_bak'):
      self.ip = ip
      self.username = username
      self.passwd = passwd
      self.port = port
      self.path = path
      self.path_exist()
      self.bak_db()
   def path_exist(self):
      if not os.path.isdir(self.path): #不存在的话就创建
         os.mkdir(self.path)
   def bak_db(self):
      filename = str(datetime.date.today())+'.sql'
      abs_file = os.path.join(self.path,filename) #变成绝对路径
      command = '''
      mysqldump -u{username} -p{passwd} -P{port} -h{ip} -A > {filename}
      '''.format(username=self.username,
               passwd=self.passwd,
               port=self.port,
               filename=abs_file,
               ip=self.ip)
      os.system(command)
      print('done!数据库备份完成！')


#db1 = BakDb('192.168.12.1','root','123456')


修改父类的方法

import redis
class Coon(object):
   #基类
   def __init__(self,host,passwd,port):
      self.host= host
      self.passwd=passwd
      self.port= port

class CoonMySql(Coon):
   def __init__(self,host,passwd,port,username,db,charset='utf8'):
      #Coon.__init__(self,host,passwd,port) #z在调用父类的构造方法，咱们自己手动调用父类的方法
      super(CoonMySql,self).__init__(host,passwd,port) #super会自动找到父类，然后调用下面的方法
      self.username=username
      self.db=db
      self.charset=charset
   def coon_mysql(self):
      print(self.host,self.host)





class CoonRedis(Coon):
   def conn(self,host,passwd,port):
      Coon.conn(self, host, passwd, port)
      redis.Redis(host=self.host,password=self.passwd,port=self.port)