用shelve模块实现Python自定义对象序列化

引入shelve模块，并自定义一个类

>>> import shelve
>>> class Person:
	def __init__(self,name,age):
		self.name=name
		self.age=age
	def __repr__(self):
		return '%s  %d' %(self.name,self.age)
	def Speak(self):
		print('我是：%s，年龄%d' %(self.name,self.age))

实例化一个Person类对象列表people

>>> people=[Person('王菲',47),Person('柳岩',36),Person('范冰冰',37)]
>>> people
[王菲  47, 柳岩  36, 范冰冰  37]

用shelve序列化people列表

>>> with shelve.open (r'd:\python\mydata') as s:
	s['mydata']=people

反序列化people列表

>>> people=[]
>>> people
[]
>>> with shelve.open (r'd:\python\mydata') as s:
	people=s['mydata']

	
>>> people
[王菲  47, 柳岩  36, 范冰冰  37]
>>> for p in people:
	p.Speak()

	
我是：王菲，年龄47
我是：柳岩，年龄36
我是：范冰冰，年龄37

一切正常，正是咱们须要的结果。实践发现，不论是用shelve仍是pickle，反序列化时，必定要有类定义。