解析python利用pickle模块完成增删改查等一些功能

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()