@Nullable
  public static PyClassTypeImpl createTypeByQName(@NotNull final PsiElement anchor,
                                                  @NotNull final String classQualifiedName,
                                                  final boolean isDefinition) {
    final PyClass pyClass = PyPsiFacade.getInstance(anchor.getProject()).createClassByQName(classQualifiedName, anchor);
    if (pyClass == null) {
      return null;
    }
    return new PyClassTypeImpl(pyClass, isDefinition);
  }
@Nullable
  public static PyClassTypeImpl createTypeByQName(@NotNull final PsiElement anchor,
                                                  @NotNull final String classQualifiedName,
                                                  final boolean isDefinition)