Since Python 3.9 is available, Home Assistant announced they were going no longer support Python versions lower than 3.8. This happens from time to time. If you run Home Assistant Core in a Python virtual environment, then you need to take action to maintain compatibility. I always forget these steps, so I decided to write an article I could always refer to.
Step 1: Install new version of Python
The first step is to install the new version of Python. How you do this will depend on what OS you are running. Many are woefully behind in their default Python versions. I run Ubuntu, and all my commands will be with Ubuntu in mind, but are easily adaptable to other distros. You check your version of Python by running the following commands:
python --version python3 --version
You’ll probably be running an older version of Python than you want. You can check your repos to see if there is an up to date version. If so, you can install it directly from the repos. Otherwise, Python is pretty easy to compile and install from source. If you wanted to install Python 3.8.5 you would do the following:
wget https://www.python.org/ftp/python/3.8.5/Python-3.8.5.tgz tar -xzf Python-3.8.5 cd Python-3.8.5 ./configure make -j 4 sudo make install
Depending on the speed of your system, this could take a little time, but should be straight forward.
Step 2: Backup your current Python packages
I don’t know if this step is strictly necessary to upgrading your Python virtual environment, but it is certainly prudent, especially if you made some changes and customization to Home Assistant that involved Python packages (like custom components). Assuming your Home Assistant config is in /home/homeassistant/.homeassistant and your Python virtual environment is in /srv/homeassistant:
cd /home/homeassistant/.homeassistant sudo -u homeassistant -H -s source /srv/homeassistant/bin/activate pip3 freeze –local > requirements.txt
This will put a listing of all your python packages in the file requirements.txt. You might want to take a peek at the file to make sure it looks right.
Step 3: Remove old Python virtual environment and create a new one
The first time I did this it was the scariest part. Instead of deleting the old python virtual environment I recommend moving/renaming it, just in case. I recommend you stop Home Assistant at this point as well, although I don’t know that it is required:
sudo systemctl stop home-assistant@homeassistant cd /srv/ sudo mv homeassistant homeassistandold python3.8 -m venv homeassistant
Step 4: Install packages and Home Assistant into Python virtual environment
You are almost done. Use the requirements.txt file you created earlier to reinstall all the packages you had installed in the previous virtual environment. Then, install Home Assistant.
sudo -u homeassistant -H -s source /srv/homeassistant/bin/activate cd /home/homeassistant/.homeassistant pip3 install -r requirements.txt
Installing the packages might take a while and you may see some errors or failures, but generally you don’t have to worry about them (I didn’t and things have always worked fine). Now install and start Home Assistant:
python3 -m pip install homeassistant sudo systemctl start home-assistant@homeassistant
That’s it. Hopefully it all goes well. It has for me the couple of times I’ve had to do it. If you’ve decided to run Home Assistant Core in a Python virtual environment you’ll probably have to do this procedure about once a year.
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