Shelve作用：以鍵值對的形式保存數據
Shelve模塊比pickle模塊簡單，只有一個open函數，返回類似字典的對象，可讀可寫：key必須是字符串，而值可以是Python所支持的數據類型。

d[]等價於d.get()

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

d={"name":"jiaxin","sex":"female"}
print(d["name"])
print(d.get("name"))
# jiaxin
# jiaxin
# 兩個取值法都可以

shelve模塊

import shelve

f=shelve.open(r"shelve_text")

#f["info"]={"name":"jiaxin","sex":"female"}
#創建數據後註釋掉進行操作

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()

13.4 Shelve模塊