Is there a way to remove all attributes from a feature class and then add new ones from an existing feature class? I have an application that is directed to a specific path, however the data it represents is updated regularly from a third party source and I have to download the updated feature class. If I were to simply load the new ones into the old I would have duplicates. I'm trying to automate this whole process with Python 2.6.
Short of writing your code for you, use arcpy.ListFields() to loop over the fields of each featureclass. Be careful not to totally denude the target class of identifying info; use an if/then w/in that loop.
You haven't really specified the common key/relate field but you'll want to keep that around, at least, in order to transfer information to relevant features in target.
P.S. why 2.6? Time to update both ArcGIS & Python!