docstr: Fixture for an indexer to pass to obj.loc to get/set the full length of the
  object.
  
  In some cases, assumes that obj.index is the default RangeIndex.
code: def full_indexer(self, request):
      """
      Fixture for an indexer to pass to obj.loc to get/set the full length of the
      object.
  
      In some cases, assumes that obj.index is the default RangeIndex.
      """
      return request.param
  
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 1 for calling the BaseSetitemTests obj's underlying member method code with example usage: obj.full_indexer(request) and returns: request