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From: Karthik <karthikgatiganti@gmail.com>
Newsgroups: linux.debian.maint.python
Subject: Re: Need a Python 3.8 virtual environment
Date: Wed, 03 Mar 2021 20:00:02 +0100
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On Wed, Mar 3, 2021 at 8:56 AM Steven Robbins <steve@sumost.ca> wrote:
>
> Hi,
>
> I'm trying to use a (non-Debian) python system built on python 3.8.  Debian's
> default is currently 3.9 so I am advised to use a virtual environment.   Being
> a newbie, I searched around and found a writeup covering several different
> virtualization tools [1].   Note I am using Debian 'sid'.
>
> I can use the tool "virtualenv" to create a virtual environment for default
> python:
>
> steve@riemann:/tmp$ virtualenv blah
> created virtual environment CPython3.9.1.final.0-64 in 77ms
>   creator CPython3Posix(dest=/tmp/blah, clear=False, no_vcs_ignore=False,
> global=False)
>   seeder FromAppData(download=False, pip=bundle, setuptools=bundle,
> wheel=bundle, via=copy, app_data_dir=/home/steve/.local/share/virtualenv)
>     added seed packages: pip==20.1.1, pkg_resources==0.0.0,
> setuptools==44.0.0, wheel==0.34.2
>   activators
> BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
>
>
> But not for python 3.8:
>
> steve@riemann:/tmp$ virtualenv -p python3.8 blah38
> RuntimeError: failed to find interpreter for Builtin discover of
> python_spec='python3.8'
>
>
> I have installed literally all the Debian python packages whose name contains
> 'python3.8'.   A very short list:
>
> ii  libpython3.8:amd64                            3.8.7-1
> amd64        Shared Python runtime library (version 3.8)
> ii  libpython3.8-dev:amd64                        3.8.7-1
> amd64        Header files and a static library for Python (v3.8)
> ii  libpython3.8-minimal:amd64                    3.8.7-1
> amd64        Minimal subset of the Python language (version 3.8)
> ii  libpython3.8-stdlib:amd64                     3.8.7-1
> amd64        Interactive high-level object-oriented language (standard
> library, version 3.8)
> ii  python3.8                                     3.8.7-1
> amd64        Interactive high-level object-oriented language (version 3.8)
> ii  python3.8-dev                                 3.8.7-1
> amd64        Header files and a static library for Python (v3.8)
> ii  python3.8-minimal
>
>
>
> I have also tried the module 'venv':
>
> steve@riemann:/tmp$ python3.8 -m venv v38
> The virtual environment was not created successfully because ensurepip is not
> available.  On Debian/Ubuntu systems, you need to install the python3-venv
> package using the following command.
>
>     apt-get install python3-venv
>
> You may need to use sudo with that command.  After installing the python3-venv
> package, recreate your virtual environment.
>
> Failing command: ['/tmp/v38/bin/python3.8', '-Im', 'ensurepip', '--upgrade',
> '--default-pip']
>
> steve@riemann:/tmp$ python3.8 -m venv blah38
> The virtual environment was not created successfully because ensurepip is not
> available.  On Debian/Ubuntu systems, you need to install the python3-venv
> package using the following command.
>
>     apt-get install python3-venv
>
> You may need to use sudo with that command.  After installing the python3-venv
> package, recreate your virtual environment.
>
> Failing command: ['/tmp/blah38/bin/python3.8', '-Im', 'ensurepip', '--
> upgrade', '--default-pip']
>
>
> Note that I do have 'python3-venv' installed, but it is the 3.9 version:
> ii  python3-venv                                  3.9.1-1
> amd64        pyvenv-3 binary for python3 (default python3 version)
>
>
> Is there something I've missed?
>
> Thank you,
> -Steve
>
> [1] https://linuxconfig.org/how-to-set-up-a-python-virtual-environment-on-debian-10-buster


try using pyenv
https://mentors.debian.net/package/pyenv/