Why don't get I get a dropbox with methods on QMainWindow?

edit

Example code:

from PyQt6.QtWidgets import QApplication, QMainWindow
import sys

app = QApplication(sys.argv)
window = QMainWindow()
window.statusBar().showMessage("Text")

When I start typing the last line window. after the dot i do not get the dropbox with available methods from Qt? Why is this? I double checked in Pycharm and there I get the correct proposal dropbox of Qt methods. Thanks!!