I use pickle to dump a file on python 3, and I use pickle to load the file on python 2, the ValueError appears.
So, python 2 pickle can not load the file dumped by python 3 pickle?
If I want it? How to do?
You should write the pickled data with a lower protocol number in Python 3. Python 3 introduced a new protocol with the number
3 (and uses it as default), so switch back to a value of
2 which can be read by Python 2.
pickle.dump. Your resulting code will look like this.
pickle.dump(your_object, your_file, protocol=2)
There is no
pickle can determine the protocol from the file.