What you see below is my situation

index.py

   ...
   def hourSplitted(self):
        self.splitlhour = SplitApp()
   ...

monthly_report.py
    
class SplitApp(QMainWindow):
   def __init__(self):
        QMainWindow.__init__(self).
        self.setupUi(self, year = False, month = False)
   def setupUi(self, MainWindow, year, month):
        if (not year):
            year = strftime(“%Y”)
            month = strftime(“%-m”)
        else:
            year = year
            month = month
    
   def dataSelect(self, MainWindow):
        m_month = self.comboMonth.currentText()
        year = self.comboYear.currentText()
        month = Functions.convert_month_number[m_month]
        self.setupUi(self, checkInput, year,month)
        
            
    if __name__ == “__main__”:
        app = QApplication(sys.argv)
        inputpars = sys.argv
        inputpars = ['2024', '04']
        year = inputpars[0]
        month = inputpars[1]
        window = SplitApp()
        app.exec_()

If SplitApp is called from index.py or from dataSelect everything works correctly.

If it is executed as a single script year and month are (rightly) the current ones.
I have tried various solutions by putting inputpars in init() or with a check in setupUi. It works from local but not when called from index.py