python_day7 综合联系

练习:定义MySQL类

  1.对象有id、host、port三个属性

  2.定义工具create_id,在实例化时为每个对象随机生成id,保证id唯一

  3.提供两种实例化方式,方式一:用户传入host和port 方式二:从配置文件中读取host和port进行实例化

  4.为对象定制方法,save和get,save能自动将对象序列化到文件中,文件名为id号,文件路径为配置文件中DB_PATH;get方法用来从文件中反序列化出对象

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ort pickle
import hashlib
import time
import set1
import os,sys
PAT=(os.path.dirname(__file__))
lib_path=PAT+r'/lib'
class Mysql:
def __init__(self,host,port):
self.host=host
self.port=port
self.id=self.create_id()
def __str__(self):
return self.id
def save(self):
write_file=lib_path+r'/%s' %(self.id)
# print(write_file)
pickle.dump(self,open(write_file,'wb'))

def get(self):
write_file=lib_path+r'/%s' %(self.id)
JG=pickle.load(open(write_file,'rb'))
print(JG.host,JG.port,JG.id)
@staticmethod
def create_id():
m5=hashlib.md5(str(time.clock()).encode('utf-8'))
return m5.hexdigest()
@classmethod
def conn(cls):
return cls(set1.Host,set1.Port)
A1=Mysql('192.168.1.1','3306')
A1.save()
A1.get()
A2=Mysql.conn()
A2.save()
A2.get()
原文地址:https://www.cnblogs.com/onda/p/7009133.html