def create_filter()

in processor.py [0:0]


def create_filter(condition: Callable[[ProcessorPart], bool]) -> PartProcessor:
  """Creates a processor that filters parts based on `condition`.

  Args:
    condition: a part is returned by this processor iff `condition(part)=True`

  Returns:
    a processor filtering the input stream
  """

  async def filter_with_condition(
      part: ProcessorPart,
  ) -> AsyncIterable[ProcessorPart]:
    if condition(part):
      yield part

  return _PartProcessorWrapper(filter_with_condition)