_pickle.UnpicklingError:找不到MARK [英] _pickle.UnpicklingError: could not find MARK

问题描述

当用成员为空集的成员参与者腌制EventFrame对象(的列表)时，出现类似 UnicodeDecodeError 的异常.

I got exceptions like UnicodeDecodeError raised when pickling (a list of) objects of EventFrame with a member participants that was an empty set.

class EventFrame:
    """Frame for an event"""
    def __init__(self, id=0):
        ...
        self.participants = set()
        ...

当它不为空时，没有任何问题，因此我首先将参与者设置为某种内容，然后对其进行腌制.但是在运行时，可能会再次清空参与者.

When it wasn't empty, there were no problems, so I first set participants to something and then pickled it. But during runtime it may happen that participants is emptied again.

因此，在这种情况下，我尝试手动删除该对象.之后，我再次用泡菜将其丢弃.

So I tried to manually delete the object in this case. After that I dumped it again using pickle.

if len(frame.participants) == 0:
    frame_list.remove(frame)

这似乎不是一个好选择，因为引发了 UnpicklingError :

That doesn't seem to be a good choice, because this UnpicklingError was raised:

....
frame_list.append (pickle.load(f))
_pickle.UnpicklingError: could not find MARK

我不知道这意味着什么，也找不到任何有用的东西.

I don't know what it means and I couldn't find anything useful about it.

注意，该错误是在加载pickle文件时引发的.

Note that this error is raised on loading the pickle file.

这是我腌制和腌制的方式:

Here is the way I'm picklng and unpickling:

f = open("myfile", "r+b")
frame_list = []
while 1:
    try:
        frame_list.append (pickle.load(f))
        frame_list = sum(frame_list, [])
    except EOFError:
        break
f.close()

并进行转储:

f = open("myfile", "r+b")
pickle.dump(frame_list, f)
f.close()   

推荐答案

由于文件的偏移量不在开头，因此引发错误_pickle.UnpicklingError: could not find MARK.解决方法是在加载泡菜之前调用f.seek(0).

The error _pickle.UnpicklingError: could not find MARK is raised because the offset of the file is not in the beginning. The solution is to call f.seek(0) before loading the pickle.

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