Package: pylint
Version: 2.16.2-2
Severity: important
Tags: upstream
X-Debbugs-Cc: dalg...@gmail.com
Dear Maintainer,
This *might* be https://github.com/pylint-dev/pylint/issues/8829 . However, I
am new to this bits of the Python eco-system, so not confident in my
assessment.
When trying to run pylint against a module that imports an _editable_ module
install, a false positive 'import-error' is given.
To reproduce, I used the following toy module:
$ find -type f -exec printf '\n%s\n' {} \; -exec cat {} \;
./pyproject.toml
[project]
name = 'ttt'
version = '0'
./ttt/__init__.py
./ttt/pylintbug.py
"""Docstring."""
def bug_func():
"""Bug."""
print('I am the bug_func')
And this module for testing:
$ cat t.py
"""Docstring."""
from ttt import pylintbug
pylintbug.bug_func()
With the module not installed, nothing works, as expected:
# nothing installed
$ pip list --user ; date
Wed Dec 27 07:31:09 PM PST 2023
$ python --version
Python 3.11.2
$ python t.py
Traceback (most recent call last):
File "/home/nexus/t.py", line 3, in
from ttt import pylintbug
ModuleNotFoundError: No module named 'ttt'
$ pylint --rcfile /dev/null t.py
* Module t
t.py:3:0: E0401: Unable to import 'ttt' (import-error)
--
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)
Install the module:
$ pip install --break-system-packages .
Defaulting to user installation because normal site-packages is not writeable
Processing /home/nexus/src/ttt
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing metadata (pyproject.toml) ... done
Building wheels for collected packages: ttt
Building wheel for ttt (pyproject.toml) ... done
Created wheel for ttt: filename=ttt-0-py3-none-any.whl size=1225
sha256=051948400d275bad5c31d656ef0394f8a43232d00754ab826bbe18dcd67d1c60
Stored in directory:
/tmp/pip-ephem-wheel-cache-upb4wjrt/wheels/c3/93/be/4d7b95f07076bb565c6c69548aef2e2868a95b899b724660dd
Successfully built ttt
Installing collected packages: ttt
Successfully installed ttt-0
And everything works as expected:
$ pip list --user ; date
Package Version
--- ---
ttt 0
Wed Dec 27 07:32:56 PM PST 2023
$ python t.py
I am the bug_func
$ pylint --rcfile /dev/null t.py
Your code has been rated at 10.00/10 (previous run: 0.00/10, +10.00)
Now, install the module and reinstall in _editable_ mode (-e):
$ pip uninstall --break-system-packages -y ttt
Found existing installation: ttt 0
Uninstalling ttt-0:
Successfully uninstalled ttt-0
$ pip install --break-system-packages -e .
Defaulting to user installation because normal site-packages is not writeable
Obtaining file:///home/nexus/src/ttt
Installing build dependencies ... done
Checking if build backend supports build_editable ... done
Getting requirements to build editable ... done
Preparing editable metadata (pyproject.toml) ... done
Building wheels for collected packages: ttt
Building editable for ttt (pyproject.toml) ... done
Created wheel for ttt: filename=ttt-0-0.editable-py3-none-any.whl size=2313
sha256=20eacec25143d7c0f57fed066c7c57dbed566853edc944919e1029a65349822b
Stored in directory:
/tmp/pip-ephem-wheel-cache-2sxotfjx/wheels/c3/93/be/4d7b95f07076bb565c6c69548aef2e2868a95b899b724660dd
Successfully built ttt
Installing collected packages: ttt
Successfully installed ttt-0
Now, executing the 't.py' script works, but pylint fails with the false
positive:
$ pip list --user ; date
Package Version Editable project location
--- --- -
ttt 0 /home/nexus/src/ttt
Wed Dec 27 07:35:24 PM PST 2023
$ python t.py
I am the bug_func
$ pylint --rcfile /dev/null t.py
* Module t
t.py:3:0: E0401: Unable to import 'ttt' (import-error)
Your code has been rated at 0.00/10 (previous run: 10.00/10, -10.00)
Reinstalling the module in regular mode and it works again:
$ pip list --user ; date
Package Version
--- ---
ttt 0
Wed Dec 27 07:38:27 PM PST 2023
$ python t.py
I am the bug_func
$ pylint --rcfile /dev/null t.py
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)
-- System Information:
Debian Release: 12.4
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.1.0-16-amd64 (SMP w/6 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages pylint depends on:
ii python33.11.2-1+b1
ii python3-astroid2.14.2-1
ii python3-dill
