Python 如何使用'；泡菜'；

我的代码（我无法使用“pickle”）：

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>

www
aaaa
ccopy_注册
_重建器
p0
（c___）主要__
A.
p1
c__内置__
对象
p2
Ntp3
Rp4
S'sss'
p5
B

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谁能告诉我如何使用。

简而言之，在你的例子中，e等于a

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不必关心这些串字符串，您可以转储这些字符串以保存到任何位置，只要记住当您加载它们时，您又得到了一个“a”对象。

您可以

pickle

（意思是，此代码按它应该的方式工作）。您似乎得到了一个结果，但并不期望得到结果。如果您期望得到相同的“输出”，请尝试：

import pickle
a = A()
s = pickle.dumps(a)
e = pickle.loads(s)
print s, pickle.dumps(e)

您的示例不是一个典型的“pickle”示例。通常，pickle对象会永久保存在某个位置或通过网络发送。请参见例如

pickletest.py

：

---

酸洗有很多高级用途，例如，请参见David Mertz XML对象序列化文章：
您想做什么？它对我有用：

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

因此，这将打印：

the original a
A:200

a2 - a clone of a before we changed the value
A:100

如果需要设置状态：

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

其中打印：

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

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