Ok, I found the solution I think. I'll try to explain as best as I can. How to use Jupyter Lab in a specific python version. Note: Read and understand before doing it to prevent any mistake Open a command prompt with "Windows key + R" and type in "cmd" and hit "Enter". In the command prompt check your python version with py -V and python - V if the versions are different and you want to set a specific version as the default one, you may need to uninstall Jupyter Lab and Notebook that are installed on the unwanted Python version with (Note: this may be a facultative step, let me know) py -3.8 -m pip uninstall notebook juyterlab As you can see "-3.8", you should change the numbers to the python version that Jupyter Lab and Notebook are installed on and use THAT YOU DON'T WANT. or pip uninstall notebook juyterlab then open the Windows Search Bar to search and access "Advanced System Settings" and then click "Environment Variables" under the "Advanced tab". On the Environment Variables dialog, you’ll see two sets of variables: one for "user variables" and the other for "system variables". Both lists have the PATH variable, so you have to decide which one to edit. see: How to Add to Windows PATH Environment Variable (helpdeskgeek.com) How to add Python to PATH in Windows 10 (configserverfirewall.com) The python version that you want to use as the default version should be on top of the unwanted version in PATH. Close your command prompt, re-launch a new one, and re-check your python version as quoted earlier. If they are the same and both show the one you want, then reinstall Jupyter Lab and Notebook with py -3.9 -m pip install notebook juyterlab (Again change the numbers according to the python version THAT YOU NOW WANT) or pip install notebook juyterlab And voilà, it should be done now! Hope this helped, if you have any suggestions please do comment. More on reddit.com

Hi:-) Installed Jupyter on Ubuntu Linux. looking on my linux intalation found that it came with Python 2.7 but the latest is 3.8. I don’t know if Jupyter caught up to 3.8 or should I use a lower Python 3x version. Any help will be much appreciated. More on discourse.jupyter.org

You can use conda list python which will display all the packages in your conda environment that include the keyword python and their version. More on reddit.com

https://jupytext.readthedocs.io/en/latest/ You’ll need to put things in a script eventually, but when you’re in that awkward stage where you’re still experimenting but you’ve written some reasonably hefty code this is golden. You can use git with the associated .py file to keep track of it. More on reddit.com