old_contents: try:
      from collections.abc import MutableMapping
  except ImportError:
      from collections import MutableMapping
  
  try:
      import simplejson as json
  except ImportError:
      import json
  
  import geojson
  
  
  mapping_base = MutableMapping
  
  
  GEO_INTERFACE_MARKER = "__geo_interface__"
  
  
  def is_mapping(obj):
      """
      Checks if the object is an instance of MutableMapping.
  
      :param obj: Object to be checked.
      :return: Truth value of whether the object is an instance of
      MutableMapping.
      :rtype: bool
      """
      return isinstance(obj, MutableMapping)
  
  
  def to_mapping(obj):
  
      mapping = getattr(obj, GEO_INTERFACE_MARKER, None)
  
      if mapping is not None:
          return mapping
  
      if is_mapping(obj):
          return obj
  
      if isinstance(obj, geojson.GeoJSON):
          return dict(obj)
  
      return json.loads(json.dumps(obj))
  
new_contents: try:
      from collections.abc import MutableMapping
  except ImportError:
      from collections import MutableMapping
  
  try:
      import simplejson as json
  except ImportError:
      import json
  
  import geojson
  
  
  GEO_INTERFACE_MARKER = "__geo_interface__"
  
  
  def is_mapping(obj):
      """
      Checks if the object is an instance of MutableMapping.
  
      :param obj: Object to be checked.
      :return: Truth value of whether the object is an instance of
      MutableMapping.
      :rtype: bool
      """
      return isinstance(obj, MutableMapping)
  
  
  def to_mapping(obj):
  
      mapping = getattr(obj, GEO_INTERFACE_MARKER, None)
  
      if mapping is not None:
          return mapping
  
      if is_mapping(obj):
          return obj
  
      if isinstance(obj, geojson.GeoJSON):
          return dict(obj)
  
      return json.loads(json.dumps(obj))
  
subject: remove unused variable