python用pickle模块实现增删改查的简易功能

Python  /  管理员 发布于 7年前   203

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 ---> 28name ---> yangbinroot@python3:/python/python2/linshi#

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