Find python installs on Linux, Windows and MacOS.
Requires Python >= 3.10 (but will discover older Python installs)
python -m ducktools.pythonfinder will provide a table of installed python versions
and their respective folders. It will also indicate the python running the
command if it is found, or the python that is the base for the venv running the command.
Python versions listed can be restricted by using the --max, --min and
--exact options to the command.
The module provides two main functions:
-
get_python_installsis a generator that will yield each python version it discovers -
list_python_installswill take the python versions discovered byget_python_installsand return a sorted list from newest to oldest python version discovered.
On Windows these methods will search the registry for PEP514 recorded python installs
before checking for any pyenv-win installs that have not been registered.
On Linux and MacOS this will search for pyenv installs first and then for any
python* binaries found on path. For those found on path they will be made
to run a small script to identify the version.
The python installs will be returned as instances of PythonInstall which will
contain version info and executable path along with some other useful metadata.
For the purposes of PEP723 script dependencies it may be useful to find another version
of python other than the one currently running in order to satisfy the requires-python
field. This tool is intended to search for potential python installs to attempt to
satisfy such a requirement.
That module appears to require searching for a specific version and will find venv pythons.
In contrast ducktools.pythonfinder simply yields python installs as they are discovered
and will attempt to avoid returning virtualenv python installs
Usage:
import os.path
from ducktools.pythonfinder import get_python_installs
user_path = os.path.expanduser("~")
for install in get_python_installs():
install.executable = install.executable.replace(user_path, "~")
print(install)Example Windows Output:
PythonInstall(version=(3, 12, 1, 'final', 0), executable='~\\.pyenv\\pyenv-win\\versions\\3.12.1\\python.exe', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 12, 1, 'final', 0), executable='~\\.pyenv\\pyenv-win\\versions\\3.12.1-win32\\python.exe', architecture='32bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 12, 1, 'final', 0), executable='~\\AppData\\Local\\Programs\\Python\\Python312\\python.exe', architecture='64bit', implementation='cpython', metadata={...})
PythonInstall(version=(3, 11, 7, 'final', 0), executable='~\\.pyenv\\pyenv-win\\versions\\3.11.7\\python.exe', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 10, 11, 'final', 0), executable='~\\.pyenv\\pyenv-win\\versions\\3.10.11\\python.exe', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 9, 13, 'final', 0), executable='~\\.pyenv\\pyenv-win\\versions\\3.9.13\\python.exe', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 8, 10, 'final', 0), executable='~\\.pyenv\\pyenv-win\\versions\\3.8.10\\python.exe', architecture='64bit', implementation='cpython', metadata={})
Example Linux Output:
PythonInstall(version=(3, 12, 1, 'final', 0), executable='~/.pyenv/versions/3.12.1/bin/python', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 12, 0, 'final', 0), executable='~/.pyenv/versions/3.12.0/bin/python', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 11, 6, 'final', 0), executable='~/.pyenv/versions/3.11.6/bin/python', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 10, 13, 'final', 0), executable='~/.pyenv/versions/3.10.13/bin/python', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 10, 12, 'final', 0), executable='/usr/bin/python3.10', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 10, 12, 'final', 0), executable='/usr/bin/python3', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 10, 12, 'final', 0), executable='~/.pyenv/versions/pypy3.10-7.3.12/bin/python', architecture='64bit', implementation='pypy', metadata={'pypy_version': '7.3.12'})
PythonInstall(version=(3, 9, 18, 'final', 0), executable='~/.pyenv/versions/3.9.18/bin/python', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 8, 18, 'final', 0), executable='~/.pyenv/versions/3.8.18/bin/python', architecture='64bit', implementation='cpython', metadata={})
PythonInstall(version=(3, 5, 2, 'final', 0), executable='/usr/bin/python3.5', architecture='64bit', implementation='cpython', metadata={})
