code: def get_content(
          cls, abspath: str, start: int = None, end: int = None
      ) -> Generator[bytes, None, None]:
          
          with open(abspath, "rb") as file:
              if start is not None:
                  file.seek(start)
              if end is not None:
                  remaining = end - (start or 0)  # type: Optional[int]
              else:
                  remaining = None
              while True:
                  chunk_size = 64 * 1024
                  if remaining is not None and remaining < chunk_size:
                      chunk_size = remaining
                  chunk = file.read(chunk_size)
                  if chunk:
                      if remaining is not None:
                          remaining -= len(chunk)
                      yield chunk
                  else:
                      if remaining is not None:
                          assert remaining == 0
                      return
docs: Retrieve the content of the requested resource which is located
          at the given absolute path.
  
          This class method may be overridden by subclasses.  Note that its
          signature is different from other overridable class methods
          (no ``settings`` argument); this is deliberate to ensure that
          ``abspath`` is able to stand on its own as a cache key.
  
          This method should either return a byte string or an iterator
          of byte strings.  The latter is preferred for large files
          as it helps reduce memory fragmentation.
  
          .. versionadded:: 3.1