13.4 Shelve模块

Posted 2020-10-29

Shelve模块

Shelve作用：以键值对的形式保存数据
Shelve模块比pickle模块简单，只有一个open函数，返回类似字典的对象，可读可写：key必须是字符串，而值可以是Python所支持的数据类型。

d[]等价于d.get()

# -*-coding:utf-8 -*-
__author__ = ‘xiaojiaxin‘
__file_name__ = ‘shelve‘

d={"name":"jiaxin","sex":"female"}
print(d["name"])
print(d.get("name"))
# jiaxin
# jiaxin
# 两个取值法都可以

shelve模块

import shelve

f=shelve.open(r"shelve_text")

#f["info"]={"name":"jiaxin","sex":"female"}
#创建数据后注释掉进行操作

data=f.get("info")
print(data)
# {‘name‘: ‘jiaxin‘, ‘sex‘: ‘female‘}
print(f.get("age","18"))
# 18
for i in f:
    print(f[i])
# {‘name‘: ‘jiaxin‘, ‘sex‘: ‘female‘}

f.close()