I recently upgraded from python 3.9.12 to 3.9.14 using asdf, and it was pretty simple:

sudo apt-get install liblzma-dev
asdf install python 3.9.14
asdf global python 3.9.14

But when I tried to run my pipenv, it didn’t work as planned

pipenv shell
No preset version installed for command pipenv
Please install a version by running one of the following:

asdf install python 3.9.14

or add one of the following versions in your config file at /home/mark/.tool-versions
python 3.9.12

After a lot of failed attemps to use asdf reshim and asdf update, I finally remembered the magic steps to use:

python -m pip install --upgrade pip
pip install pipenv

asdf update
asdf reshim python 3.9.14   # or whatever newest version is

pipenv install
pipenv shell
pipenv update   # To actually install what was in Pipfile

The last trick that I needed to do was make sure that my .env gets read so that any Python environment variables I set are correctly read in.

vi ~/.local/share/virtualenvs/hostname-RANDOM/bin/activate

And add these 2 lines starting at line 4 of the activate script:

# Use this sequence to load up the environnment variables from your .env file in a Bash console:
#
set -a; source /home/mark/home/aei/aeicloud.22/.env; set +a

I’ll be using asdf to help control what version of Python I’m running.

I like pipenv to help manage my Python virtual environments.

I like to use PostgreSQL with Django, so lets’ first make sure that it’s installed:

sudo apt install postgresql 
sudo apt install libpq-dev

# make sure it's running
# You should see it listening to lots of ports
ss -nlt

asdf

git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch v0.10.0

# modify .bashrc files, exit terminal and restart terminal

sudo apt-get update
sudo apt-get upgrade

# install packages necessary to build stuff
sudo apt install wget build-essential libreadline-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev liblzma-dev

asdf plugin-add python

asdf install python 3.9.12
asdf global python 3.9.12

If the correct version of Python isn’t detected, you might need to reshim.

python -m pip install --upgrade pip
pip install pipenv

asdf update
asdf reshim python 3.9.12

pipenv install

[pipenv.exceptions.ResolutionFailure]: Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
You can use $ pipenv install –skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
Hint: try $ pipenv lock –pre if it is a pre-release dependency.
ERROR: metadata generation failed

Turned out the above error, was because I didn’t have postgres installed on the new box (and my django uses postgres)

 Error: pg_config executable not found.

I got much futher along

# how to know things are almost all the way there
./manage.py shell

python manage.py dbshell

# If you didn't setup your postgres, you'll get an error like:
# python manage.py dbshell
# psql: error: connection to server at "127.0.0.1", port 5432 failed: Connection refused
#         Is the server running on that host and accepting TCP/IP connections?

You’ll need to start the server:

sudo service postgresql start

Then try

python manage.py dbshell
psql: error: connection to server at "127.0.0.1", port 5432 failed: FATAL:  password authentication failed for user "abcuser"
connection to server at "127.0.0.1", port 5432 failed: FATAL:  password authentication failed for user "abcuser"

The user and database don’t appear to exist — so let’s create them:

sudo su - postgres
# skipping the lines as you login as user postgres


psql
# now you are in the postgres shell

CREATE DATABASE abcdb;
CREATE USER abcuser WITH PASSWORD 'abc123';

\q     # that exists the postgres shell

exit   # that logs out the postgres user

You should now be able to init the DB

python manage.py migrate
python manage.py createsuperuser

# then run any bootstrapping that you need to
# python manage.py loaddata  xyz.json

# needed for pango and weasyprint (creating PDFs)
sudo apt-get install libpangocairo-1.0-0

Now, to get django working in VSCode

1. install the Python extension for Visual Studio Code
2. Press F1, then choose Python: Select Interpreter and make sure you are pointing to your correct venv
3. Press the Run and Debug Icon

Sometimes it is useful to know who has committed code to your repo.  Here’s a super useful “one-liner” that can show you that info quite quickly:

 

git log --format="%ae" | sort | uniq -c