ValueError: insecure string pickle

Question

When I am trying to load something I dumped using cPickle, I get the error message:

ValueError: insecure string pickle

Both the dumping and

Answer 1

I've get this error in Python 2.7 because of open mode 'rb':

    with open(path_to_file, 'rb') as pickle_file:
        obj = pickle.load(pickle_file)

So, for Python 2 'mode' should be 'r'

Also, I've wondered that Python 3 doesn't support pickle format of Python 2, and in case when you'll try to load pickle file created in Python 2 you'll get:

pickle.unpicklingerror: the string opcode argument must be quoted