A virtualenv Python discovery plugin for pyenv-installed interpreters
Project description
virtualenv-pyenv
A virtualenv Python discovery plugin for pyenv–installed interpreters
Installation
pip install virtualenv-pyenv
Usage
The Python discovery mechanism can be specified by:
-
the CLI option
--discovery
:virtualenv --discovery pyenv -p 3.10 testenv
-
the environment variable
VIRTUALENV_DISCOVERY
:export VIRTUALENV_DISCOVERY=pyenv virtualenv -p 3.10 testenv
-
the config option
discovery
:[virtualenv] discovery = pyenv
virtualenv -p 3.10 testenv
-
the virtualenvwrapper environment variable
VIRTUALENVWRAPPER_VIRTUALENV_ARGS
:export VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--discovery=pyenv' mkvirtualenv -p 3.10 testenv
Operation Mode
The plugin supports several operation modes. The operation mode affects various aspects of the discovery process.
mode | specifier | path specifier | fallback to builtin |
---|---|---|---|
compat |
optional | allowed | no |
fallback |
optional | allowed | yes |
strict |
required | error | no |
The mode is specified as a part of the discovery method name: pyenv-{mode}
, e.g.,
virtualenv --discovery=pyenv-fallback -p 3.10 testenv
or
export VIRTUALENV_DISCOVERY=pyenv-strict
virtualenv -p 3.10 testenv
If no mode is specified, the compat
mode is used, that is, --discovery=pyenv
is the same as --discovery=pyenv-compat
.
The compat
mode is recommended for most cases. It mimics closely the builtin
discovery plugin to maximize compatibility with existing tools (e.g., build, tox):
- if no specifier is provided, the plugin falls back to
sys.executable
, even if it is not installed by pyenv; - if a path specifier (
-p /path/to/bin/python
) is provided, the path is used, even if it is not installed by pyenv; - otherwise (
-p 3.7
,-p py37
), only pyenv–installed interpreters are used.
The fallback
mode is the same as compat
, but in addition falls back to the builtin
plugin if no interpreter was found. If multiple specifiers are provided, all of them are tried first before falling back to the builtin
plugin as a last resort.
The strict
mode, as its name suggests, ensures that only pyenv–installed interpreters are used:
- a specifier is required,
sys.executable
is never used as a fallback, even if it is installed by pyenv (may be relaxed in the future); - a path specifier is not allowed, even if the path points to a pyenv–installed interpreter (may be relaxed in the future);
- no fallback to the
builtin
plugin.
Python Specifier Format
The plugin supports two specifier formats informally called “pyenv-style” and “virtualenv-style”.
The version part of both specifier formats can contain one (major
), two (major.minor
), or three (major.minor.patch
) components. When a one–component version is specified, the latest installed final minor release is selected, ignoring pre–/dev–release. When a two–component version is specified, the latest installed final patch release is selected, ignoring pre–/dev–releases. When a three–component version is specified, the exact final release is selected, ignoring pre–/dev–releases. The pre–/dev–release version is selected only if it is explicitly requested.
installed | requested | selected |
---|---|---|
3.9.5 ; 3.9.17 , 3.10.0 |
3 |
3.10.0 |
3.9.5 ; 3.9.17 , 3.10.0 |
3.9 |
3.9.17 |
3.9.5 ; 3.9.17 , 3.10.0 |
3.9.5 |
3.9.5 |
3.9.5 ; 3.9.17 , 3.10.0 |
3.9.0 |
— |
3.12-dev ; 3.12.0b3 |
3.12 |
— |
3.12-dev ; 3.12.0b3 |
3.12.0 |
— |
3.12-dev ; 3.12.0b3 |
3.12-dev |
3.12-dev |
3.12-dev ; 3.12.0b3 |
3.12.0b3 |
3.12.0b3 |
pyenv–style
The same format as used by pyenv (pyenv install --list
).
- a final version with 1 version component:
3
- a final version with 2 version components:
3.11
- a final version with 3 version components:
3.11.2
- a pre–release version:
3.13.0a4
,3.12.0b3
,3.11.0rc1
- a dev version:
3.13-dev
virtualenv–style
The same format as used by virtualenv (docs). A subset of this format is used by tox (docs).
- a relative or absolute path:
/path/to/bin/python
(it can be any Python interpreter, not only installed by pyenv) - a final version with 1 version component:
py3
,python3
,cpython3
,python3-32
,py3-64
- a final version with 2 version components:
311
,py311
,py3.11
,python311
,cpython3.11
,python3.11-32
,py311-64
- a final version with 3 version components:
py3.11.2
,python3.11.2
,cpython3.11.2
,python3.11.2-32
,py3.11.2-64
Limitations
- Only CPython is supported at the moment.
- The
architecture
part (-32
/-64
) of a specifier is ignored. For example, all of the following specifiers match any installed CPython 3.8.1 regardless of the architecture:python3.8.1
,python3.8.1-32
,python3.8.1-64
.
Internals
virtualenv-pyenv does not rely on pyenv to discover Python interpreters, that is, it never calls any pyenv command and does not require pyenv to be in PATH
. Instead, the plugin uses pyenv-inspect library, which, in turn, inspects $PYENV_ROOT/versions
directory contents.
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