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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