Use the files within Python_v3_Scripts_Pro_Package for use with Pro.
All other files are associated with Python 2.x and ArcMap.

Python_function_v3.py - is the Python v3 using Python 3.x syntax for a simple python function.

The Python_Functions_Custom_Toolbox contains to subfolders.

Use the \Toolboxes\Image Processing.pyt file from within the Pro Project file to review the Python script code and run the tasseled cap tool.

Right click on the .PYT file and then Edit to bring up the tool python script in a Python script editor.

rasterdata1 - contains the tm_sacsub.img - a 6 band Lansat TM 5 image.  This folder is shown as the "Data" folder in the Tasseled Cap Tool execution video.

rasterdata - contains the output of the tasseled cap.

brigh1.img - brightness component
green1.img -greeness component
wet1.img - wetness component
tc_out.img - tasseled cap multi-band image resulting from the CompositeBands routine used in the custom Python Script Tasseled Cap tool. 