用shelve模塊實現Python自定義對象序列化

引入shelve模塊,並自定義一個類python

>>> 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,年齡%d' %(self.name,self.age))

實例化一個Person類對象列表peoplecode

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

用shelve序列化people列表對象

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

反序列化people列表it

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

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

	
我是:王菲,年齡47
我是:柳巖,年齡36
我是:范冰冰,年齡37

一切正常,正是咱們須要的結果。實踐發現,不論是用shelve仍是pickle,反序列化時,必定要有類定義。class

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