Closed
Description
openedon May 17, 2020
Problem you have encountered:
I just installed flax and tried to import it from the iPython shell. But it raises an AttributeError.
In [1]: import flax
*snip*
~/.virtualenvs/flax2/lib/python3.7/site-packages/dataclasses.py in _is_classvar(a_type, typing)
548 # This test uses a typing internal class, but it's the best way to
549 # test if this is a ClassVar.
--> 550 return type(a_type) is typing._ClassVar
551
552
AttributeError: module 'typing' has no attribute '_ClassVar'
This does not happen in the normal interpreter, where everything goes fine.
What you expected to happen:
I expected the import to work the same in iPython and the normal python shell.
Logs, error messages, etc:
Full traceback in this gist: https://gist.github.com/bayerj/96f096c7fb09a7c9b758dabdbca32671
Steps to reproduce:
On Mac OS X with Python 3.7.6, not anaconda, virtuelenvwrapper installed.
❯❯❯ mkvirtualenv flax2
❯❯❯ pip install jaxlib
*snip*
❯❯❯ pip install flax
*snip*
❯❯❯ ipython
*snip*
In [1]: import flax
Workaround
The problem seems to be in the dataclasses package–not python's own one–from PyPI. If I uninstall it...
❯❯❯ pip uninstall dataclasses
Found existing installation: dataclasses 0.6
Uninstalling dataclasses-0.6:
Would remove:
/Users/bayerj/.virtualenvs/debug2/lib/python3.7/site-packages/dataclasses-0.6.dist-info/*
/Users/bayerj/.virtualenvs/debug2/lib/python3.7/site-packages/dataclasses.py
Proceed (y/n)? y
Successfully uninstalled dataclasses-0.6
❯❯❯ ipython
/usr/local/lib/python3.7/site-packages/IPython/core/interactiveshell.py:931: UserWarning: Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv.
warn("Attempting to work in a virtualenv. If you encounter problems, please "
Python 3.7.6 (default, Dec 30 2019, 19:38:28)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.9.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import flax
... this goes fine.
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