爲什麼我們不能拍攝InteractiveInterpreter的實例？

嘗試鹹菜InteractiveInterpreter結果的一個實例，在下面的錯誤爲什麼我們不能拍攝InteractiveInterpreter的實例？

 

    File "", line 1, in 
    File "/usr/lib/python2.7/pickle.py", line 224, in dump 
    self.save(obj) 
    File "/usr/lib/python2.7/pickle.py", line 286, in save 
    f(self, obj) # Call unbound method with explicit self 
    File "/usr/lib/python2.7/pickle.py", line 725, in save_inst 
    save(stuff) 
    File "/usr/lib/python2.7/pickle.py", line 286, in save 
    f(self, obj) # Call unbound method with explicit self 
    File "/usr/lib/python2.7/pickle.py", line 649, in save_dict 
    self._batch_setitems(obj.iteritems()) 
    File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems 
    save(v) 
    File "/usr/lib/python2.7/pickle.py", line 286, in save 
    f(self, obj) # Call unbound method with explicit self 
    File "/usr/lib/python2.7/pickle.py", line 649, in save_dict 
    self._batch_setitems(obj.iteritems()) 
    File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems 
    save(v) 
    File "/usr/lib/python2.7/pickle.py", line 286, in save 
    f(self, obj) # Call unbound method with explicit self 
    File "/usr/lib/python2.7/pickle.py", line 649, in save_dict 
    self._batch_setitems(obj.iteritems()) 
    File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems 
    save(v) 
    File "/usr/lib/python2.7/pickle.py", line 306, in save 
    rv = reduce(self.proto) 
    File "/usr/lib/python2.7/copy_reg.py", line 70, in _reduce_ex 
    raise TypeError, "can't pickle %s objects" % base.__name__ 
TypeError: can't pickle ellipsis objects

這是奇怪的InteractiveInterpreter不是根據我所知道的省略號對象。有什麼理由？是否有任何替代方法來pickle InteractiveInterpreter對象？

來源

2012-11-06 gibraltar

想必'InteractiveInterpreter'實例的子對象。當你醃製東西時，遞歸地醃製。 –

你可以嘗試用'__set/getstate__'來處理它們。 – lolopop

順便說一句，奇怪的是'省略號'是不可挑選的...它只是一個像'None'的單身人士，在酸洗它時我沒有看到任何問題。 – Bakuriu

由於某種原因，Ellipsis不能在pickler中醃製。但您可以使用persistent id功能來實現此目的。

首先，您應該使用Pickler和Unpickler對象，而不是pickle.dump和pickle.load。第二，你必須定義兩個函數 - 第一個將獲取一個對象並返回它的id（或者None用於定期酸洗），第二個將在取消打印時將該id轉換爲對象。

工作例如：

import cPickle as pickle 

def dump_ellipsis(obj): 
    if obj is Ellipsis: 
     return "Ellipsis" 

def load_ellipsis(persid): 
    if persid == "Ellipsis": 
     return Ellipsis 


storage = open("tmp.pkl", "w") 

pickler = pickle.Pickler(storage) 

pickler.persistent_id = dump_ellipsis 

pickler.dump(Ellipsis) 

storage.close() 

storage = open("tmp.pkl") 

unpickler = pickle.Unpickler(storage) 

unpickler.persistent_load = load_ellipsis 

print unpickler.load()

來源

2012-11-06 18:37:23 mechmind

爲什麼我們不能拍攝InteractiveInterpreter的實例？

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