Recursive Feature Compare

I have a requirement to compare two geodatabases to ensure that the copy procedure has worked correctly.
The Feature Compare tool gives me the basis for the Python script and then I am looping using:
featureclasses = arcpy.ListFeatureClasses("all")
The looping appears fine but I am having no success getting the result written out to the 'compare_file"
nominated in the Feature Compare command.

Has anyone written a similar recursive tool?
If you have suggestions regarding appending the output from Feature Compare in a file or any other suggestions
that would be great.

Many thanks

Ian Musto