Not an expert but would recommend you to look at pyenv with virtualenv from the start. This allows you to use python3 version of your choice in virtual environm

Not an expert but would recommend you to look at pyenv with virtualenv from the start. This allows you to use python3 version of your choice in virtual environment based say per project etc. Obviously, this landscape has been changing rapidly lately and other people might recommend different tools, but for manual (or automated) server deployment I like this - I can test new versions of libraries and python (3.7.2 ;) and switch between them super easily without affecting/breaking each other.