NUKE: Batch Render Using PYTHON script

Got rendering outside of Nuke's UI to work, but because there's no license server running, it outputs renders that have the little colorful dots.

Using a modified technique from HERE, you can call a script from within Nuke's UI and it'll execute and rendering without the little dots. YAY!

Put in your Render.py (or whatever you want your file to be called):
nuke.execute("writenode", startFrame, endFrame, steps)

Then >FILE>TCL File...> and load your .py file.