@Nullable
  public static PsiElement getPythonStub(@NotNull PyElement element) {
    final PsiFile file = element.getContainingFile();
    if (pyButNotPyiFile(file)) {
      final PyiFile pythonStubFile = getPythonStubFile((PyFile)file);
      if (pythonStubFile != null) {
        return findSimilarElement(element, pythonStubFile);
      }
    }
    return null;
  }
@Nullable
  public static PsiElement getPythonStub(@NotNull PyElement element)