Python 序列化 pickle/cPickle模块使用介绍

> import pickle,cPickle
> info_dict = {'name':'yeho','age':100,'Lang':'Python'}
> f = open('info.pkl','wb')
> pickle.dump(info_dict,f)
> f.close()
> exit()

# cat info.pkl
(dp0
S'Lang'
p1
S'Python'
p2
sS'age'
p3
I100
sS'name'
p4
S'yeho'
p5
s.

> import cPickle
> info_dict
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
NameError: name 'info_dict' is not defined
> f = open('info.pkl','r+')
> info2_dict = cPickle.load(f)
> info2_dict
{'Lang': 'Python', 'age': 100, 'name': 'yeho'}
> info2_dict['age'] = 110
> cPickle.dump(info2_dict,f)
> f.close()
> exit()

> import pickle
> f = open('info.pkl','r+')
> info_dict = pickle.load(f)
> info_dict
{'Lang': 'Python', 'age': 100, 'name': 'yeho'}
> info2_dict = pickle.load(f)
> info2_dict
{'Lang': 'Python', 'age': 110, 'name': 'yeho'}
> info3_dict = pickle.load(f)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python2.6/pickle.py", line 1370, in load
 return Unpickler(file).load()
 File "/usr/lib64/python2.6/pickle.py", line 858, in load
 dispatch[key](self)
 File "/usr/lib64/python2.6/pickle.py", line 880, in load_eof
 raise EOFError
EOFError