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#

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