ImportError: No module named functools_lru_cache

[courtyardz]

I am unsure if the issue is caused by my recent upgrade to Ubuntu 18.10. I have tried reinstalling td-watson and the backports.functools_lru_cache through pip. But I keep getting the following error:

Traceback (most recent call last):
  File "/usr/local/bin/watson", line 7, in <module> from watson.__main__ import cli
  File "/usr/local/lib/python2.7/dist-packages/watson/__init__.py", line 1, in <module> from .watson import __version__  # noqa
  File "/usr/local/lib/python2.7/dist-packages/watson/watson.py", line 14, in <module> import arrow
  File "/usr/local/lib/python2.7/dist-packages/arrow/__init__.py", line 3, in <module>from .arrow import Arrow
  File "/usr/local/lib/python2.7/dist-packages/arrow/arrow.py", line 19, in <module> from arrow import util, locales, parser, formatter
  File "/usr/local/lib/python2.7/dist-packages/arrow/parser.py", line 12, in <module>from backports.functools_lru_cache import lru_cache  # pragma: no cover
ImportError: No module named functools_lru_cache

Any ideas on how to fix? As far as I can tell, backports.functools_lru_cache is installed correctly into .../python2.7/dist-packages/directory.

[MinchinWeb]

What version of arrow is installed? Version 0.11.0 is broken, and version 0.12.0 does weird things if your system has both Python 2 and Python 3 installed. The latest version of arrow is 0.12.1.

[courtyardz]

Thanks, but arrow is 0.12.1.

[plup]

I get the same error on first install:

$ pip install --user watson

$ watson --help
Traceback (most recent call last):
  File "/home/plup/.local/bin/watson", line 7, in <module>
    from watson.__main__ import cli
  File "/home/plup/.local/lib/python2.7/site-packages/watson/__init__.py", line 1, in <module>
    from .watson import __version__  # noqa
  File "/home/plup/.local/lib/python2.7/site-packages/watson/watson.py", line 14, in <module>
    import arrow
  File "/home/plup/.local/lib/python2.7/site-packages/arrow/__init__.py", line 3, in <module>
    from .arrow import Arrow
  File "/home/plup/.local/lib/python2.7/site-packages/arrow/arrow.py", line 19, in <module>
    from arrow import util, locales, parser, formatter
  File "/home/plup/.local/lib/python2.7/site-packages/arrow/parser.py", line 12, in <module>
    from backports.functools_lru_cache import lru_cache  # pragma: no cover
ImportError: No module named functools_lru_cache

$ pip show arrow
Name: arrow
Version: 0.12.1
Summary: Better dates and times for Python
Home-page: https://github.com/crsmithdev/arrow/
Author: Chris Smith
Author-email: crsmithdev@gmail.com
License: Apache 2.0
Location: /home/plup/.local/lib/python2.7/site-packages
Requires: python-dateutil, backports.functools-lru-cache

The debian testing packaged version (1.6.0) works though

[jmaupetit]

🤔 looks like we need to fix project requirements.

[tanius]

Same issue here, under Ubuntu 18.04 though.

For the meantime, a workaround is installing watson 1.6.0 from the Debian Testing repo under Ubuntu:

wget http://ftp.debian.org/debian/pool/main/w/watson/watson_1.6.0-3_all.deb
wget http://ftp.debian.org/debian/pool/main/w/watson/python3-watson_1.6.0-3_all.deb
sudo apt install -y ./watson_1.6.0-3_all.deb ./python3-watson_1.6.0-3_all.deb

[jmaupetit]

Hey @tanius 👋 Thanks for the info: I didn't know there was a Debian package for Watson 😉

[ThomasWaldmann]

arrow-py/arrow#495

[plup]

Another "workaround" is to install it with python3:

$ pip3 install --user td-watson

This is good enough to me !

[davidag]

@jmaupetit As @ThomasWaldmann mentioned, this was an arrow issue. Maybe this could be closed hoping that it's definitely fixed 🤞