Feature Request because of the issue(difficult to add a custom Python version, and packages)

Hey there currently i´m building a docker julia template i want to share with everyone.
https://github.com/MalteBoehm/julia_docker-compose_template

The current issue is that when i install my own python environment, PyCall adds a HOMEPYTHON Env variable which causes a Fatal Python error and its not possible to unset those variables.

See here:
https://github.com/MalteBoehm/julia_docker-compose_template/blob/main/Dockerfile

My suggestion is to add parameters to PyCall from the very beginning, like Python Version and if should install packages via

environment.yml ->
`conda env create environment.yml
conda activate yourEnviroment`

This is the Error i get:
`Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding

Python runtime state: core initialized

ModuleNotFoundError: No module named 'encodings'

Current thread 0x00007f43d5ea5b48 (most recent call first):
Current thread 0x00007f84a9e9bb48 (most recent call first):

Python path configuration:

PYTHONHOME = '/root/.pyenv/versions/3.7.8:/root/.pyenv/versions/3.7.8'

PYTHONPATH = (not set)

program name = '/root/.pyenv/versions/3.7.8/bin/python3'

isolated = 0

environment = 1

user site = 1

import site = 1

sys._base_executable = '/root/.pyenv/versions/3.7.8/bin/python3'

sys.base_prefix = '/root/.pyenv/versions/3.7.8'

sys.base_exec_prefix = '/root/.pyenv/versions/3.7.8'

sys.platlibdir = 'lib'

sys.executable = '/root/.pyenv/versions/3.7.8/bin/python3'

sys.prefix = '/root/.pyenv/versions/3.7.8'

sys.exec_prefix = '/root/.pyenv/versions/3.7.8'

sys.path = [

'/root/.pyenv/versions/3.7.8/lib/python39.zip',

'/root/.pyenv/versions/3.7.8/lib/python3.9',

'/root/.pyenv/versions/3.7.8/lib/python3.9/lib-dynload',

]

Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding

Python runtime state: core initialized

ModuleNotFoundError: No module named 'encodings'`

Thanks for your help

Start by reproducing the failure using the linked Dockerfile and the PyCall setup described in the issue, then inspect PyCall’s existing Python configuration entry points. The issue names no repository files or tests; done would mean a documented way to select a Python version and install packages from environment.yml without the reported fatal initialization error.

Scritto dal modello di indicizzazione a partire dal testo della issue.