Method _is_window_created

PySimpleGUI/PySimpleGUI.py:12620–12630

(self, additional_message='')

        return self.read(*args, **kwargs)

    def _is_window_created(self, additional_message=''):
        msg = str(additional_message)
        if self.TKroot is None:
            warnings.warn(
                'You cannot perform operations on a Window until it is read or finalized. Adding a "finalize=True" parameter to your Window creation will fix this. ' + msg,
                UserWarning)
            if not SUPPRESS_ERROR_POPUPS:
                _error_popup_with_traceback('You cannot perform operations on a Window until it is read or finalized.',
                                            'Adding a "finalize=True" parameter to your Window creation will likely fix this', msg)
            return False
        return True

    def _has_custom_titlebar_element(self):
        for elem in self.AllKeysDict.values():