-
- def __len__(self):
- """len(:class:`Filenames`) returns the number of contained files
-
- .. note::
-
- As this iterates over the files, we will not be able to
- iterate over them again! So this will fail::
-
- #THIS FAILS
- files = Database().get_directory('').get_child_files()
- if len(files) > 0: # this 'exhausts' msgs
- # next line raises
- # NotmuchError(:attr:`STATUS`.NOT_INITIALIZED)
- for file in files: print file
- """
- if not self._files_p:
- raise NotInitializedError()
-
- i = 0
- while self._valid(self._files_p):
- self._move_to_next(self._files_p)
- i += 1
- self._files_p = None
- return i