I want to try using Flask with Python3. I've got Python 3.4 on Ubuntu 14.04, which supposedly ships with pip included. So I tried pip3 install flask this ends in: Cleaning up... Command /usr/bin/ More on stackoverflow.com

Start a venv before you install any packages More on reddit.com

Are you confusing a virtual environment and a virtual machine? You used them together in the post and I wasn't sure which you meant. You only need to install flask a single time to a virtual environment. Create a virtual environment (lots of yt tutorials on this) Make sure the environment is activated. You should see the name of your environment in brackets above your active cursor in the command line. Pip install flask. Now everytime you want to work on your app you activate this same virtual environment. Flask and any other modules will already be installed in it. Virtual environments are like mini virtual machines but it's not a full os. It's just a small isolated environment which allows you to install your modules without conflicting with any other modules. A virtual machine is an entire operating system like Linux or windows. You are able to have as many virtual environments as you want, and it's good practice to keep it beside your code so you can always find it. You mentioned running in vscode, it's possible that when you're doing this, vscode is opening the file without using your virtual environment. Double check when you're running in vscode that your virtual environment is activate. If its not then you need to activate it first in the terminal in vscode and try again. If you have multiple terminals open these are all independant of each other so activating the virtual environment in one terminal, then trying to run the code from a different one won't work. Hope this helps, good luck! More on reddit.com

Congratulations on finish this! Now comes Dev ops. You'd need a few things to help with production. I'd recommend a Linux server coz of the selenium requirement. You should be serving with something like gunicorn. Add supervisord, a python package, to ensure workers are spinned up if they fail. You can further add nginx if you think you'll have some outsiders access this and need to start designing properly and scaling. As for selenium, I hope you are running it with the headless options enabled? Because Linux servers typically only have command line access and no x11 running. You can spoof one to run. Additionally, for example with Firefox, you'd need to download geckodriver and add it to your $PATH(create a link in /use/bin? If selenium needs to be called and run something and return values to frontend, you might want to look into installing Redis and python-rq to run those jobs. More on reddit.com