Question
my code(i was unable to use 'pickle'):
class A(object):
def __getstate__(self):
print 'www'
return 'sss'
def __setstate__(self,d):
print 'aaaa'
import pickle
a = A()
s = pickle.dumps(a)
e = pickle.loads(s)
print s,e
print :
www
aaaa
ccopy_reg
_reconstructor
p0
(c__main__
A
p1
c__builtin__
object
p2
Ntp3
Rp4
S'sss'
p5
b. <__main__.A object at 0x00B08CF0>
who can tell me how to use.
Solution
What are you trying to do? It works for me:
class A(object):
def __init__(self):
self.val = 100
def __str__(self):
"""What a looks like if your print it"""
return 'A:'+str(self.val)
import pickle
a = A()
a_pickled = pickle.dumps(a)
a.val = 200
a2 = pickle.loads(a_pickled)
print 'the original a'
print a
print # newline
print 'a2 - a clone of a before we changed the value'
print a2
print
print 'Why are you trying to use __setstate__, not __init__?'
print
So this will print:
the original a
A:200
a2 - a clone of a before we changed the value
A:100
If you need setstate:
class B(object):
def __init__(self):
print 'Perhaps __init__ must not happen twice?'
print
self.val = 100
def __str__(self):
"""What a looks like if your print it"""
return 'B:'+str(self.val)
def __getstate__(self):
return self.val
def __setstate__(self,val):
self.val = val
b = B()
b_pickled = pickle.dumps(b)
b.val = 200
b2 = pickle.loads(b_pickled)
print 'the original b'
print b
print # newline
print 'b2 - b clone of b before we changed the value'
print b2
which prints:
Why are you trying to use __setstate__, not __init__?
Perhaps __init__ must not happen twice?
the original b
B:200
b2 - b clone of b before we changed the value
B:100
OTHER TIPS
You are able to pickle
(meaning, this code works as it should). You just seem to get a result, you don't expect. If you expect the same 'output', try:
import pickle
a = A()
s = pickle.dumps(a)
e = pickle.loads(s)
print s, pickle.dumps(e)
Your example isn't, well, a typical 'pickling' example. Usually pickled objects are saved somewhere persistently or sent over the wire. See e.g. pickletest.py
: http://www.sthurlow.com/python/lesson10/.
There are advanced uses of pickling
, see for example David Mertz XML object serialisation article: http://www.ibm.com/developerworks/xml/library/x-matters11.html
In a nutshell, in your example, e equals a.
Don't have to care about these strang strings, you can dumps these strings to save to anywhere, just remember when you loads them, you got 'a' object again.