code: def classify(self, peer_dir_meta):
          
          assert self.classification is None
          peer_entry_meta = None
          if peer_dir_meta:
              # Metadata is generally available, so we can detect 'new' or 'modified'
              peer_entry_meta = peer_dir_meta.get(self.name, False)
  
              if self.is_dir():
                  # Directories are considered 'unmodified' (would require deep traversal
                  # to check otherwise)
                  if peer_entry_meta:
                      self.classification = "unmodified"
                  else:
                      self.classification = "new"
              elif peer_entry_meta:
                  # File entries can be classified as modified/unmodified
                  self.ps_size = peer_entry_meta.get("s")
                  self.ps_mtime = peer_entry_meta.get("m")
                  self.ps_utime = peer_entry_meta.get("u")
                  if (
                      self.size == self.ps_size
                      and FileEntry._eps_compare(self.mtime, self.ps_mtime) == 0
                  ):
                      self.classification = "unmodified"
                  else:
                      self.classification = "modified"
              else:
                  # A new file entry
                  self.classification = "new"
          else:
              # No metadata available:
              if self.is_dir():
                  # Directories are considered 'unmodified' (would require deep traversal
                  # to check otherwise)
                  self.classification = "unmodified"
              else:
                  # That's all we know, but EntryPair.classify() may adjust this
                  self.classification = "existing"
  
          if PRINT_CLASSIFICATIONS:
              write("classify {}".format(self))
          assert self.classification in ENTRY_CLASSIFICATIONS
          return self.classification
docs: Classify this entry as 'new', 'unmodified', or 'modified'.