python用pickle模块实现“增删改查”的简易功能_Python

python用pickle模块实现“增删改查”的简易功能

2020-11-15 22:38yangbin Python

本篇文章主要介绍了python用pickle模块实现“增删改查”的简易功能，具有一定的参考价值，感兴趣的小伙伴们可以参考一下。

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#