code: def _is_pclass(bases):
      return len(bases) == 1 and bases[0] == CheckedType
  
imports: 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 1 for calling a global function with example usage: _is_pclass(bases) and returns: unknown