@Nullable
  public static PyCollectionType toKeywordContainerType(@NotNull PsiElement anchor, @Nullable PyType valueType) {
    final PyBuiltinCache builtinCache = PyBuiltinCache.getInstance(anchor);

    return Optional
      .ofNullable(builtinCache.getDictType())
      .map(PyClassType::getPyClass)
      .map(dictClass -> new PyCollectionTypeImpl(dictClass, false, Arrays.asList(builtinCache.getStrType(), valueType)))
      .orElse(null);
  }
@Nullable
  public static PyCollectionType toKeywordContainerType(@NotNull PsiElement anchor, @Nullable PyType valueType)