pickle模块
import pickle
person = {'name':'MT','age':25}
s = pickle.dumps(person)
p = pickle.loads(s)
pickle.dump(person,open('pickle_db','wb'))
p = pickle.load(open('pickle_db','rb'))
print(p)
print(type(p))
shelve模块
import shelve
scores = [99,100,88]
student = {'name':'MT','age':25}
db = shelve.open('shelve_student')#声明创建一个数据库
db['s'] = student #将字典表student序列化到数据库文件里,并且赋予键值's'
db['scores'] = scores
len(db) #检查数据库中有几个对象,用len()查看键值
2
temp_student = db['s']
temp
Traceback (most recent call last):
File "<input>", line 1, in <module>
NameError: name 'temp' is not defined
temp_student
{'name': 'MT', 'age': 25}
type(temp_student)
<class 'dict'>
temp_scores
[99, 100, 88]
type(temp_scores)
<class 'list'>
shelve序列化自定义类实例
import shelve
class Student:
def __init__(self,name,age):
self.name = name
self.age = age
def __str__(self):
return self.name
def wirte_shelve():
s = Student('Tom',25)
db = shelve.open('shelve_student_db')
db['s'] = s
db.close()
def read_shelve():
db = shelve.open('shelve_student_db')
st = db['s']
print(st)
print(st.name)
print(st.age)
db.close()
if __name__ == '__main__':
read_shelve()