Setting Up Python3.8 and Jupyterlab

I'm using Ubuntu 16.04 on this machine, so that's what the steps of installation here will be for. But this installation shouldn't largely vary on any distro that's 14.04 and higher.

Step 1 - Download Python source code

Binary installations are available for Windows and Mac but you can either install Python3.8 on Ubuntu using "apt" or download and install from source. I did the latter. Obtain the gz file from here.

 cd <path-of-archive>
 tar zxvf Python-3.8.0.tgz
 cd Python-3.8.0
 ./configure
 make
 sudo make altinstall

We use make altinstall instead of make install so that your existing Python configuration not be disturbed.

This process should likely complete in under a minute.

Confirm that it has successfully installed -

 python3.8 

(should return the IDLE prompt with Python version 3.8.0)

Step 2 - Install python3.8 specific virtualenv

There are a few differences in Python3.8 that prevent your existing virtualenv from being useful in creating a virtual environment supporting this version of Python. So install virtualenv corresponding to Python3.8.

 sudo pip3.8 install virtualenv

This should likely be installed in /usr/local/bin/. So, confirm that it exists -

 /usr/local/bin/virtualenv --version 

(should return the latest version of virtualenv = 16.7.7 as of this writing)

Step 3 - Create a virtual environment

Use the installation of virtualenv created in Step 2 to create a virtual environment with the Python path pointed to python3.8 (-p). Preferably create a folder for all your virtual environments if you don't have a preferred directory already.

 cd
 mkdir .virtual_environments
 cd .virtual_environments
 /usr/local/bin/virtualenv -p python3.8 <name of environment>

Example - /usr/local/bin/virtualenv -p python3.8 py38

Step 4 - Activate this environment and install jupyterlab in it.

cd to the folder where you created the virtual environment. Using the environment we created in Step 3 -

 cd ~/.virtual_environments
 source py38/bin/activate
 pip list (You should see only a few packages in your new environment.)
 pip install jupyterlab

Now you can traverse to the directory where you want your Jupyter-lab notebook to be spawned and trigger it using jupyter-lab and the default kernel (if you don't have any other kernel installed) that will be picked up will be running Python3.8.

Fin.

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