code: def get_page_names(self):
          '''Return a list of page names (directories) under source_dir.'''
          fis = [p  for p in glob.glob(os.path.join(self._dirs['source'], \
                                       "*")) if os.path.isdir(p)]
          fis = [os.path.split(p)[1] for p in fis ]
          return fif get_page_names(self):
          '''Return a list of page names (directories) under source_dir.'''
          fis = [p  for p in glob.glob(os.path.join(self._dirs['source'], \
                                       "*")) if os.path.isdir(p)]
          fis = [os.path.split(p)[1] for p in fis ]
          return fis
docs: Return a list of page names (directories) under source_dir.