code: def enter_ListValue(self, node):
      list_type = get_nullable_type(self.get_input_type())
      self._input_type_stack.append(
          list_type.of_type
          if isinstance(list_type, GraphQLList)
          else None
      )
  
imports: from ..language import visitor_meta
  from ..type.definition import GraphQLInputObjectType, GraphQLList, get_named_type, get_nullable_type, is_composite_type
  from .get_field_def import get_field_def
  from .type_from_ast import type_from_ast
label_desc: Use image node_id 17 for calling the TypeInfo obj's underlying member method code with example usage: obj.enter_ListValue(node) without return types