Re: [PLUG] Fixing a Python library mismatch

[Fred Stluka via plug <plug@lists.phillylinux.org>]

On 5/16/20 4:14 PM, Walt Mankowski via plug wrote:
> I think both venv and pyvenv are more than I need most of the
> time.
Walt,

Keep in mind that Python virtual environments are astonishingly
lightweight.  Much, much, much simpler than you might expect.
I dodged them for a little while, as one more complication that
I didn;t yet need.  Not true.  Really simple and really useful.  I
now use them for EVERY python project, no matter how small.

As I explained to a friend recently...

Not like a heavy "virtual machine", VM, that you'd get from
VMware, AWS, etc.  That's a whole OS running in a hypervisor.

Not like a lighter, but still heavy "container" that you'd get from
Docker.  That's a containerized set of files, containing everything
except a copy of the OS.

A Python "virtual environment" is very simple.  A directory, a
change to your PATH and to another environment variable or
two.  All installs of Python libraries, add-ons, etc., go in the
directory tree and the right version of Python and that tree get
found via the PATH and env vars.

Astoundingly useful and lightweight.  Can have as many
different virtualenvs as you like, each in it's own folder.  To
"uninstall" one, just delete the folder.  Use the generated
"virtualenv" (or venv or pyenv) command to create them.  It
also generates "activate" and "deactivate" scripts (or Windows
BAT files) to switch from one virtualenv to another.

Here's a page that explains how simple virtualenvs are:
- https://www.recurse.com/blog/14-there-is-no-magic-virtualenv-edition

@Walt, it's pitched at a real newbie level, so you'll just want to
scan it quick and see that it basically says what I said above.
It's a nice article though to show someone less with less Linux
experience.

Enjoy!
--Fred
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Fred Stluka
Bristle Software, Inc.
http://bristle.com 		#DontBeATrump #SadLittleDonny
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