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Description:

pylintvenv 3.0.3

pylint-venv
Pylint does not respect the currently activated virtualenv if it is not
installed in every virtual environment individually. This module provides
a Pylint init-hook to use the same Pylint installation with different virtual
environments.

Installation
pip install pylint-venv
Add the hook to your Pylint configuration. See the section below corresponding
to the type of configuration file you use.

Configure with pyproject.toml
Add the following to your pyproject.toml:
[tool.pylint.MAIN]
init-hook = """
try: import pylint_venv
except ImportError: pass
else: pylint_venv.inithook()
"""

Configure with .pylintrc
Add the following to your .pylintrc:
[MAIN]
init-hook=
try: import pylint_venv
except ImportError: pass
else: pylint_venv.inithook()
If you add this to your ~/.pylintrc in your home directory, it will be
applied to all projects by default.

Usage
The hook will then be used automatically if

a virtualenv without pylint is active,
or a Conda environment without pylint is active,
or no environment is active but your CWD contains virtualenv directory.

Anything listed in the PYLINT_VENV_PATH environment variable is considered
a virtualenv directory. The default, if the variable is unset, is .venv. Use
a colon (:) as path separator. Example for checking directories .venv and
.virtualenv:
PYLINT_VENV_PATH=.venv:.virtualenv
You can also call the hook via a command line argument:
$ pylint --init-hook="import pylint_venv; pylint_venv.inithook()"
This way you can also explicitly set an environment to be used:
$ pylint --init-hook="import pylint_venv; pylint_venv.inithook('$(pwd)/env')"
If pylint itself is installed in a virtualenv, then you can ignore it by passing
force_venv_activation=True to force the activation of a different virtualenv:
$ pylint --init-hook="import pylint_venv; pylint_venv.inithook(force_venv_activation=True)"
This will try to automatically detect virtualenv and activate it.

Troubleshooting

General

pylint_venv fails to import
Most likely pylint-venv is not installed in the same virtual environment as
pylint. Either make sure to ensure pylint-venv into the same virtual environment
as pylint, or add the appropriate path in the init hook:
import sys
sys.path.append("/path/to/installation/folder/of/pylint_venv")

pylint_venv breaks parsing with tools
When tools call pylint with -f json, an extra line may break the parser, as the
output is no longer valid json. To avoid printing “using venv …”, pass quiet=True
to inithook
$ pylint -f json --init-hook="import pylint_venv; pylint_venv.inithook(quiet=True)"

Virtual environment does not get used (installed modules are reported as ‘unable to import’)
Most likely the virtual environment does not get activated because pylint itself
runs in a virtual environment. You can force the activation of the virtual
environment with the force_venv_activation=True flag to the
pylint_venv.inithook function.

Homebrew
Homebrew installs pylint into a separate virtual environment, thus you will
need to set the force_venv_activation=True flag. This also means, that
pylint_venv will be in a different search path and you must add the proper
path to sys.path. You can use the following configuration adjusted to your
Python version:
[MAIN]
init-hook=
import sys
sys.path.append("/usr/local/lib/python3.8/site-packages")
try: import pylint_venv
except ImportError: pass
else: pylint_venv.inithook(force_venv_activation=True)