Python- defining Startup Scripts relative to project

Getting started with Python in Unreal
In the Python Plugin you can define the paths for a StartupScript as well as a 'Additional path(s).

So for instance I am using
C:/UnrealPython/StartupScript.py

But instead I want the path to be project relative, ie relative to my .uproject file.
How do I doo this?

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I also really want to know how to set a project relative path!