TeamCity checkout rules

In team city Version Control Settings you can include/exclude the path for checkout.
Here are a few examples:

• I want to checkout only the directories:/project1/testing/watirtests, and /project1/ant, but not anything else under project1:

-:project1
+:project1/testing/watirtests
+:project1/ant

• I want to checkout everything but derectories:/project1/testing/watirtests, and /project1/ant:

+:project1
-:project1/testing/watirtests
-:project1/ant

Python recursive generator to find all the files in a directory

Just for exercise, I programed the following transverse_directory function in python to find out all the files in a directory tree in python, while trying the google treasure hunt - zip:

def transverse_directory(path):
   if os.path.isdir(path):
        for item in os.listdir(path):
            item_path = os.path.abspath(path) + os.sep + item
              for file in tranverse_directory(item_path):
                  yield file
   else:
       yield path