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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def indentation_pre_event_input_accelerators(editor, event):
 """ Implements indentation pre event input accelerators. :param editor: Document editor. :type editor: QWidget :param event: Event being handled. :type event: QEvent :return: Process event. :rtype: bool """


    process_event = True
    if not hasattr(editor, "indent"):
        return process_event

    if event.key() == Qt.Key_Tab:
        process_event = editor.indent() and False
    elif event.key() == Qt.Key_Backtab:
        process_event = editor.unindent() and False
    return process_event