python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#

来源：http://www.cnblogs.com/yangbin1110/p/6938429.html?utm_source=tuicool&utm_medium=referral