On IDEs like Pycharm, code completion doesn't works for just that specific namespace, and it also throws a warning if we enable Unresolved References warnings from (File / Settings / Editor / Inspections / Python). Those are the 2 main issues that I've found so far.
You can reproduce that issue with the next example.
If you type QApplication it will complete code without issues, no warnings. If you do the same with Qt then there's no suggestions, and you get a warning.