用pickle模块实现“增删改查”的简易功能

pickle的作用：

1：pickle.dump(dict,file)把字典转为二进制存入文件.

2：pickle.load(file)把文件二进制内容转为字典

import pickle

# 增 
def adds(): 
	users = {"name":"yangbin", "age":22, "sex":"male"} 
	with open("red.txt", "wb") as f: 
	 	pickle.dump(users, f)
	dic = {} 
	with open("red.txt") as sd: 
		dic = pickle.load(sd) 
	print dic

# 删 
def deletes():
	dic = {} 
 	with open("red.txt") as f: 
 		dic = pickle.load(f)
 	dic.pop("sex")
 	with open("red.txt", "wb") as ff: 
 		pickle.dump(dic, ff)  
 	print dic 

# 改 
def changes(): 
 	dic = {}
 	with open("red.txt") as f: 
 		dic = pickle.load(f) 
 	dic["age"] = 28 
 	with open("red.txt", "wb") as f: 
 		pickle.dump(dic, f)  
 	print dic

# 查 
def finds(): 
	dic = {}
	with open("red.txt") as f: 
		dic = pickle.load(f) 
	for k,v in dic.items():
		print "%s ---> %s" % (k, v)  

adds() 
deletes() 
changes()
finds()

运行结果:

root@python3:/python/python2/linshi# python 01.py 
{'age': 22, 'name': 'yangbin', 'sex': 'male'}
{'age': 22, 'name': 'yangbin'}
{'age': 28, 'name': 'yangbin'}
age ---> 28
name ---> yangbin
root@python3:/python/python2/linshi#