python shelve模块

Posted 2021-02-09 F

 

#coding=utf-8
import shelve

f = shelve.open("shelve_test")
f[‘info‘] = "alex"
f["age"] = [1,34,5,6,33,44]
f["name"] = {"name":"alex","add":"sz"}
f.close()

f = shelve.open("shelve_test")
# 这里这个f我们就可以理解为是一个字典对象，所以shelve存储数据就按照字典的方式存储数据


print(f.get("info"))
print(f.get("age"))
print(f.get("name"))
print(f[‘info‘])
print(f.values())
print(f.items())
print(f.keys())

输出

alex
[1, 34, 5, 6, 33, 44]
{‘name‘: ‘alex‘, ‘add‘: ‘sz‘}
alex
ValuesView(<shelve.DbfilenameShelf object at 0x000001A88D374208>)
ItemsView(<shelve.DbfilenameShelf object at 0x000001A88D374208>)
KeysView(<shelve.DbfilenameShelf object at 0x000001A88D374208>)

 

#coding=utf-8
import shelve
with shelve.open("test_shelve.db") as f:
    f["k1"] = {
        "name":"xiaoming1",
        "age":12,
        "address":"beijing1"
    }
    f["k2"] = {
        "name":"xiaoming2",
        "age":12,
        "address":"beijing2"
    }
    f["k3"] = {
        "name":"xiaoming3",
        "age":12,
        "address":"beijing3"
    }
    f["k4"] = ["小明1","小明2","小明3"]
with shelve.open("test_shelve.db") as f:
    print(f["k1"]["name"])
    print(f["k4"][0])

输出

xiaoming1
小明1

 

#coding=utf-8
import shelve
test_list=[1,2,3,4,5]
test_dict={"aaa":23,"bbb":33}
s="xiaoming"
with shelve.open("shelve.ini","wc") as f:
    f["k1"] = test_list
    f["k2"] = test_dict
    f["k3"] = s
 
with shelve.open("shelve.ini","rc") as k:
    print(k["k3"])
    print(k["k2"])
    print(k["k1"])

输出

xiaoming
{‘aaa‘: 23, ‘bbb‘: 33}
[1, 2, 3, 4, 5]

 

#coding=utf-8
import shelve


list = [1, 2, 3]
she = shelve.open(‘test.dat‘)
she[‘d‘] = list
she[‘d‘].append(‘f‘)
print(she[‘d‘])


list = [1, 2, 3]
she = shelve.open(‘test.dat‘)
she[‘d‘] = list
temp = she[‘d‘]
temp.append(‘f‘)
she[‘d‘] = temp
print(she[‘d‘])

输出

[1, 2, 3]
[1, 2, 3, ‘f‘]