【下载文档:  python用pickle模块实现“增删改查”的简易功能.txt 】

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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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