无法从文件加载pickle对象

-1

我只是尝试了泡菜模块和学习它的功能和实用程序。我写了一小段代码，但它给我带来麻烦。无法从文件加载pickle对象

import pickle 
myfile = open("C:\\Users\\The Folder\\databin.txt", 'r+') #databin.txt is completely blank 
class A: 
    def __init__ (self): 
     self.variable = 25 
     self.random = 55 
pickle.dump (A, myfile, -1) #HIGHEST_PROTOCOL 
pickle.load (myfile)

然后我得到以下错误：

Traceback (most recent call last): 
File "<pyshell#9>", line 1, in <module> 
pickle.load (myfile) 
File "C:\Python27\lib\pickle.py", line 1378, in load 
return Unpickler(file).load() 
File "C:\Python27\lib\pickle.py", line 858, in load 
dispatch[key](self) 
KeyError: '\x00'

来源

2012-08-12 user1452509

你的代码没有意义，你可以只腌对象的实例，但不能直接调用类。 – 2012-08-12 08:47:48

你需要首先关闭该文件，然后重新打开该工作;并使用二进制模式打开您的文件。

最后但并非最不重要的，泡菜可以存储实例类只，而不是类本身：

filename = "C:\\Users\\The Folder\\databin.txt" 
with open(filename, 'wb') as myfile: 
    pickle.dump(A(), myfile, -1) #HIGHEST_PROTOCOL 
with open(filename, 'rb') as myfile: 
    pickle.load(myfile)

在这里，我使用的文件作为上下文管理器，它会自动对时关闭with套房已退出。

来源

2012-08-12 08:28:17

基本上，马丁说的是正确的。您需要先关闭文件，然后重新打开它。如果你没有，你会得到一个错误。我使用dill，而不是泡菜，所以我可以泡菜。

Python 3.3.5 (default, Mar 10 2014, 21:37:38) 
[GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))] on darwin 
Type "help", "copyright", "credits" or "license" for more information. 
>>> import dill 
>>> myfile = open('pickle.pkl', 'rb+') 
>>> 
>>> class A: 
... def __init__(self): 
...  self.variable = 25 
...  self.random = 55 
... 
>>> dill.dump(A, myfile, 2) 
>>> dill.load(myfile) 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/Users/mmckerns/lib/python3.3/site-packages/dill-0.2.2.dev-py3.3.egg/dill/dill.py", line 187, in load 
    obj = pik.load() 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/pickle.py", line 847, in load 
    raise EOFError 
EOFError

现在，关闭文件，然后再试一次...记得先打开它。

>>> myfile.close() 
>>> dill.load(myfile) 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/Users/mmckerns/lib/python3.3/site-packages/dill-0.2.2.dev-py3.3.egg/dill/dill.py", line 187, in load 
    obj = pik.load() 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/pickle.py", line 845, in load 
    key = read(1) 
ValueError: read of closed file 
>>> 
>>> myfile = open('pickle.pkl', 'rb+') 
>>> dill.load(myfile) 
<class '__main__.A'>

来源

2014-10-13 14:42:56

无法从文件加载pickle对象

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