How to go back Selenium Python?

I have a question, if I write a program and I put this line of code.

self.get(').click() again? so there is no problem going back to my program at that time? or must I just wait until my program complete the task and it can start over again?
A good way to handle this is using subprocess. In general I would recommend avoiding "coding against an interface". If your Python app talks to your Selenium, use subprocess. You can tell your Python app to start a new instance of Selenium-interactive-server, run your tests and (via the REST api) submit results back to you.

How do I check my Selenium version in Python?

I use Selenium in my Django App and my default userAgent is Mozilla/5.

0(Windows NT 10.0; Win64; x64) AppleWebKit/537.36(KHTML, like Gecko) Chrome/73.0(3683.116 Safari/537.36
I was wondering if I have the latest version of selenium if I am running from my default userAgent? I am asking this because earlier when I had older versions of Selenium, running Selenium in Firefox, I would get a popup message that says "Version X of selenium is not supported". But now with newer versions, I do not get any error even though I am running the latest Selenium. I am not getting an error so I am assuming that I have the latest version of Selenium.

However my question is, is my assumption correct? If yes then how to check the version and update to the latest? I tried the below command: pip show selenium. But it gives me this : Name: selenium. Version: 3.141.59
Location: /home/jupyter/.local/lib/python3.6/site-packages
Requires: python3<4.3,>=3.6 jupyter
Satisfiable: python3<3.6 Installed-By: apt @ ubuntu-bionic. As there is no selenium/chromedriver installed for python3, you are safe to assume you are using the latest selenium available for python3. To determine the latest selenium available for python3 (it will probably be 2.48), use pip.

How to upgrade Selenium version using pip?

I need to upgrade the Selenium version of a Python project from 2.

49.0 to 2.53. I know that I can do it using:
Pip install selenium --upgrade. However, the problem is that I have multiple projects using Selenium and I don't want to do it in every project separately. Also, I am not sure if using pip install --upgrade will work for both Python 2.7 and Python 3.6 versions.

My question is, is there any way to get all the projects to use the same version of Selenium using pip? You can use virtualenv for this.