[Python] pickle module

python对象与文件之间的序列化和反序列化：
pickle.dump()
pickle.load()

pickle.dump(obj, file, [,protocol])

protocol=>0 ASCII,1 older protocol,2 new protocol, it is necessary to open with'rb,wb'if protocal>=1

pickle.load(file)

 1 import pickle
 2 
 3 #can pickleable something like tuple,set list dictionary
 4 table = {
 5     'jack': 90,
 6     'bob': 80,
 7     'c': 85
 8 }
 9 
10 with open('table.plk', 'wb') as f:
11     #pickle.dump(obj, file, [,protocol])
12     #protocol 0:ASCII(default) 1:older protocol,2 newer protocol
13     #open with "wb" since the protocol is set highest as -1
14     pickle.dump(table, f,-1)
15 
16     
17 with open('table.plk', 'rb') as f:
18     # pickle.load(file)
19     table = pickle.load(f)
20     print table

python对象和字符串间的序列化和反序列化

obj2=pickle.dumps(obj)
obj1=pickle.loads(obj2)
 
 1 >>> table = {'tom': 85, 'bob': 80, 'jack': 90}
 2 >>> import pickle
 3 >>> table = {'tom': 85, 'bob': 80, 'jack': 90}
 4 >>> p=pickle.dumps(table)
 5 >>> print p
 6 (dp0
 7 S'bob'
 8 p1
 9 I80
10 sS'jack'
11 p2
12 I90
13 sS'tom'
14 p3
15 I85
16 s.
17 >>> type(p)
18 <type 'str'>
19 >>> t2=pickle.loads(p)
20 >>> print t2
21 {'bob': 80, 'jack': 90, 'tom': 85}
22 >>> type(t2)
23 <type 'dict'>

 

posted @ 2014-01-02 23:15  Yu Zi  阅读(318)  评论(0)  编辑  收藏  举报