Error when using Astroid 2.1.0

[clintonb]

I get the following error when running pylint for a fresh install:

pylint --rcfile=pylintrc todo_project_name *.py
Traceback (most recent call last):
  File "/usr/local/bin/pylint", line 11, in <module>
    sys.exit(run_pylint())
  File "/usr/local/lib/python3.6/site-packages/pylint/__init__.py", line 20, in run_pylint
    Run(sys.argv[1:])
  File "/usr/local/lib/python3.6/site-packages/pylint/lint.py", line 1568, in __init__
    linter.load_plugin_modules(plugins)
  File "/usr/local/lib/python3.6/site-packages/pylint/lint.py", line 650, in load_plugin_modules
    module = modutils.load_module_from_name(modname)
  File "/usr/local/lib/python3.6/site-packages/astroid/modutils.py", line 202, in load_module_from_name
    return load_module_from_modpath(dotted_name.split("."), path, use_sys)
  File "/usr/local/lib/python3.6/site-packages/astroid/modutils.py", line 245, in load_module_from_modpath
    module = imp.load_module(curname, mp_file, mp_filename, mp_desc)
  File "/usr/local/lib/python3.6/imp.py", line 245, in load_module
    return load_package(name, filename)
  File "/usr/local/lib/python3.6/imp.py", line 217, in load_package
    return _load(spec)
  File "<frozen importlib._bootstrap>", line 684, in _load
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/local/lib/python3.6/site-packages/pylint_django/__init__.py", line 6, in <module>
    from pylint_django import plugin
  File "/usr/local/lib/python3.6/site-packages/pylint_django/plugin.py", line 5, in <module>
    from pylint_django.checkers import register_checkers
  File "/usr/local/lib/python3.6/site-packages/pylint_django/checkers/__init__.py", line 3, in <module>
    from pylint_django.checkers.models import ModelChecker
  File "/usr/local/lib/python3.6/site-packages/pylint_django/checkers/models.py", line 11, in <module>
    from pylint_django.utils import node_is_subclass, PY3
  File "/usr/local/lib/python3.6/site-packages/pylint_django/utils.py", line 4, in <module>
    from astroid.util import YES
ImportError: cannot import name 'YES'

The offending code is at
https://github.com/PyCQA/pylint-django/blob/2ef61325fa2f0ca291099a599c197f79f01c5bb1/pylint_django/utils.py#L4

Astroid 2.1.0 was released a couple hours ago.

Given this project's dependency on Astroid, should it be listed in setup.py? That dependency needs to be limited to 2.0.4 for the time being.

[carlio]

This was in the compatability layer here for a while, might be worth revisiting the decision to remove it @atodorov ?

Thanks for the report and PR @clintonb ! I will merge this for now but since every CI setup has different dependency settings I think we might need to, in the long term, have more of those compat fudges.

[atodorov]

@carlio I think when I deleted the compatibility layer I replaced the imports with their to-be-deprecated counter parts instead of the new ones.

Not sure if we want this compatibility layer back or not. Also in the referenced PR I see a failure in Travis, maybe caused by other changes in pylint itself. Will look at them tomorrow.

[kerrermanisNL]

Just so it's very explicitly placed here, you can fix this by setting astroid==2.0.4 in your requirements as a work around.

[carlio]

Pinning astroid==2.0.4 and pylint==2.1.1 should fix this.

@atodorov The PR is failing as the new pylint API seems to have removed a visit that pylint-django augments : pylint-dev/pylint@41d47dd#diff-58c6e1eef6e54ed1b2900be32164f516L77

I will put the compat layer back as there are too many combinations of dependencies of pylint-django dependencies and build system configurations to be too rigid with how pylint-django works. I know it's a bit ugly but it prevents builds from breaking for people often and gives us time to do a new release without always having bug reports from disgruntled users!

[carlio]

Just uploaded 2.0.4 which will fix this.