troubleshooting from earlier weewx thread

#+BEGIN_SRC bash
root@weewx-84bfc8b796-gwrr7:/home/weewx#  apt install python3-pil
Reading package lists... Done
Building dependency tree
Reading state information... Done
python3-pil is already the newest version (5.4.1-2+deb10u2).
0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.
#+END_SRC

#+BEGIN_SRC bash
root@weewx-84bfc8b796-gwrr7:/home/weewx# python3 -c "import Image"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'Image'

root@weewx-84bfc8b796-gwrr7:/home/weewx# python3 -c "from PIL import Image"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'PIL'

root@weewx-84bfc8b796-gwrr7:/home/weewx# python3 -c "import sys; print(sys.path)"
['', '/usr/local/lib/python39.zip', '/usr/local/lib/python3.9', '/usr/local/lib/python3.9/lib-dynload', '/opt/venv/lib/python3.9/site-packages']
root@weewx-84bfc8b796-gwrr7:/home/weewx#
#+END_SRC

#+BEGIN_SRC bash
root@weewx-84bfc8b796-gwrr7:/home/weewx# apt list python3-pil
Listing... Done
python3-pil/stable,now 5.4.1-2+deb10u2 armhf [installed]
N: There is 1 additional version. Please use the '-a' switch to see it

root@weewx-84bfc8b796-gwrr7:/home/weewx# apt show python3-pil
Package: python3-pil
Version: 5.4.1-2+deb10u2
Priority: optional
Section: python
Source: pillow
Maintainer: Matthias Klose <doko@debian.org>
Installed-Size: 1266 kB
Provides: python3-pillow
Depends: python3 (<< 3.8), python3 (>= 3.7~), python3:any, mime-support | python3-pil.imagetk, libc6 (>= 2.11), libfreetype6 (>= 2.2.1), libimagequant0 (>= 2.11.10), libjpeg62-turbo (>= 1.3.1), liblcms2-2 (>= 2.2+git20110628), libtiff5 (>= 4.0.3), libwebp6 (>= 0.5.1), libwebpdemux2 (>= 0.5.1), libwebpmux3 (>= 0.6.1-2), zlib1g (>= 1:1.1.4)
Recommends: python3-olefile
Suggests: python-pil-doc, python3-pil-dbg
Conflicts: python3-imaging (<< 1.1.7+2.0.0-1.1)
Breaks: python3-imaging (<< 1.1.7+2.0.0-1.1)
Replaces: python3-imaging (<< 1.1.7+2.0.0-1.1)
Homepage: http://python-pillow.github.io/
Download-Size: 367 kB
APT-Manual-Installed: yes
APT-Sources: http://deb.debian.org/debian buster/main armhf Packages
Description: Python Imaging Library (Python3)

N: There is 1 additional record. Please use the '-a' switch to see it

root@weewx-84bfc8b796-gwrr7:/home/weewx# cat /etc/issue
Debian GNU/Linux 10 \n \l
#+END_SRC