code: def remove(self, item):
      if item in self._pclass_evolver_data:
          del self._pclass_evolver_data[item]
          self._factory_fields.discard(item)
          self._pclass_evolver_data_is_dirty = True
          return self
  
      raise AttributeError(item)
  
imports: import six
  from pyrsistent._checked_types import InvariantException, CheckedType, _restore_pickle, store_invariants
  from pyrsistent._field_common import set_fields, check_type, is_field_ignore_extra_complaint, PFIELD_NO_INITIAL, serialize, check_global_invariants
  from pyrsistent._transformations import transform
label_desc: Use image node_id 5 for calling the _PClassEvolver obj's underlying member method code with example usage: obj.remove(item) and returns: self