我的代码(我无法使用'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
打印 :
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>
谁能告诉我如何使用。
最佳答案
你想做什么?这个对我有用:
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
所以这将打印:
the original a
A:200
a2 - a clone of a before we changed the value
A:100
如果需要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
打印:
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
关于python - 如何使用 'pickle',我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/2019489/