Can't read pickle file

[ronyarmon]

I have no problem reading pickle files with pandas (pd.read_pickle(filename)) using python on the command line (3.7.3; Ubuntu 19.04) but when trying load the very same file from the terminal with ipython (or in a notebook I'm getting:

ValueError: unsupported pickle protocol: 4
The full traceback:

ValueError Traceback (most recent call last)
in ()
----> 1 data=pd.read_pickle ('sentences.pkl')

/home/rony/.local/lib/python2.7/site-packages/pandas/io/pickle.pyc in read_pickle(path, compression)
177 lambda f: pc.load(f, encoding=encoding, compat=True))
178 try:
--> 179 return try_read(path)
180 except Exception: # noqa: E722
181 if PY3:

/home/rony/.local/lib/python2.7/site-packages/pandas/io/pickle.pyc in try_read(path, encoding)
175 except Exception: # noqa: E722
176 return read_wrapper(
--> 177 lambda f: pc.load(f, encoding=encoding, compat=True))
178 try:
179 return try_read(path)

/home/rony/.local/lib/python2.7/site-packages/pandas/io/pickle.pyc in read_wrapper(func)
146 is_text=False)
147 try:
--> 148 return func(f)
149 finally:
150 for _f in fh:

/home/rony/.local/lib/python2.7/site-packages/pandas/io/pickle.pyc in (f)
175 except Exception: # noqa: E722
176 return read_wrapper(
--> 177 lambda f: pc.load(f, encoding=encoding, compat=True))
178 try:
179 return try_read(path)

/home/rony/.local/lib/python2.7/site-packages/pandas/compat/pickle_compat.pyc in load(fh, encoding, compat, is_verbose)
225 up.is_verbose = is_verbose
226
--> 227 return up.load()
228 except (ValueError, TypeError):
229 raise

/usr/lib/python2.7/pickle.pyc in load(self)
862 while 1:
863 key = read(1)
--> 864 dispatchkey
865 except _Stop, stopinst:
866 return stopinst.value

/usr/lib/python2.7/pickle.pyc in load_proto(self)
890 proto = ord(self.read(1))
891 if not 0 <= proto <= 2:
--> 892 raise ValueError, "unsupported pickle protocol: %d" % proto
893 dispatch[PROTO] = load_proto
894

ValueError: unsupported pickle protocol: 4

A similar issue pertaining to Python 2/3 was closed but mine seem to differ as I'm able to read the pickle file with python but not with ipython.

[MPrazzoli]

have you find any solutions? I am in the same situation you described, I want to unpickle file directly in Jupyter, but kernel always died after I try to plot the dataframe already retrieved from the pickle object

[kevin-bates]

This sounds like something that should be opened in the IPython repo since the kernel is having the issue.

Should we find a link back to this repository, we can re-open this then.