old_contents: import sys
  import geojson
  
  try:
      import simplejson as json
  except ImportError:
      import json
  from collections import MutableMapping
  is_mapping = lambda obj: isinstance(obj, MutableMapping)
  mapping_base = MutableMapping
  
  
  GEO_INTERFACE_MARKER = "__geo_interface__"
  
  
  def to_mapping(obj):
      mapping = getattr(obj, GEO_INTERFACE_MARKER, None)
      if mapping is None:
          if is_mapping(obj):
              mapping = obj
          else:
              if isinstance(obj, geojson.GeoJSON):
                  mapping = dict(obj)
              else:
                  mapping = json.loads(json.dumps(obj))
      return mapping
  
new_contents: import geojson
  
  
  try:
      import simplejson as json
  except ImportError:
      import json
  from collections import MutableMapping
  is_mapping = lambda obj: isinstance(obj, MutableMapping)
  mapping_base = MutableMapping
  
  
  GEO_INTERFACE_MARKER = "__geo_interface__"
  
  
  def to_mapping(obj):
      mapping = getattr(obj, GEO_INTERFACE_MARKER, None)
      if mapping is None:
          if is_mapping(obj):
              mapping = obj
          else:
              if isinstance(obj, geojson.GeoJSON):
                  mapping = dict(obj)
              else:
                  mapping = json.loads(json.dumps(obj))
      return mapping
  
subject: Remove unused import