How to update Python which download from official website? I'm mac user, and I downloaded Python from the offcial website. What if I want to update Python, what should I do? I also installed the Java JDK from offcial website, both of them are .pkg, can someone tell me how to update them if they can be updated?
If you have homebrew installed you can type in the terminal:

brew install python3


Otherwise you can just download it again from the website and install it.

If you don't know which version of python you have installed type python --version or python3 --version. Similar questions have been answered on SO and other websites.