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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