I'm trying to set a the transparency of layers in ArcMap (using arcpy) based on the below requirements/premises:

Set the transparency of any valid polygon layer (i.e. the data source is not broken) in an ArcMap document based on the following criteria: if the polygon layer is next to (immediately above or below) a polyline layer, set 60 as the transparency value for the polygon layer; otherwise set 40 as the transparency value of the polygon layer.

I am also trying to write code to list & print the information below for layers in ArcMap (also after importing arcpy): Number of feature layers (including x point layers, x polyline layers, and x polygon layers) & the Number of raster layers:

Help would be greatly appreciated! Listing in python is often confusing for me.