code: def __getitem__(self, field_name):
      if self.media_type == fomm.VIDEO and fofu.is_frame_number(
          field_name
      ):
          return self.frames[field_name]
  
      return super().__getitem__(field_name)
  
imports: import os
  from bson import ObjectId
  from fiftyone.core.document import Document, DocumentView
  import fiftyone.core.frame
  import fiftyone.core.frame_utils
  import fiftyone.core.labels
  import fiftyone.core.metadata
  import fiftyone.core.media
  import fiftyone.core.odm
  import fiftyone.core.utils
  from fiftyone.core.singletons import SampleSingleton
label_desc: Use image node_id 3 for calling the _SampleMixin obj's underlying member method code with example usage: obj.__getitem__(field_name) and returns: super, self