PyQt5: nested layouts

[Rich Shepard]

I thought that I understood how to nest layouts, but I'm getting an error:
$ python test.py 
QLayout: Attempting to add QLayout "" to TestWindow "", which already has a layout

When the test.py module used a grid layout with a container named,
'container', there was no problem. But, trying to replace the grid with a
series of QHBoxLayout within a QVBoxLayout the above warning displays. I'm
not seeing why. The test.py file is attached.

Please show me what I've done incorrectly.

Rich
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#!/usr/bin/env python3

import sys

from PyQt5 import QtWidgets as qtw
from PyQt5 import QtGui as qtg
from PyQt5 import QtCore as qtc

class TestWindow(qtw.QWidget):
    def __init__(self):
        super().__init__()
        test = qtw.QWidget(windowTitle='Testing')
        
        # Layout
        inner = qtw.QVBoxLayout(self)
        self.setLayout(inner)
        row1 = qtw.QHBoxLayout(self)
        inner.addLayout(row1)
        id_label = qtw.QLabel('Site ID', self)
        row1.addWidget(id_label)
        id_nbr = qtw.QLineEdit(self,
            clearButtonEnabled = True,
            maxLength = 16
        )
        row1.addWidget(id_nbr)

        site_name_label = qtw.QLabel('Site Name', self)
        row1.addWidget(site_name_label)
        site_name = qtw.QLineEdit(self,
            clearButtonEnabled = True,
            maxLength = 64
        )
        row1.addWidget(site_name)
        
        self.show()
         
    # Methods
    def save(self):
        pass

    def cancel(save):
        pass


if __name__ == '__main__':
    app = qtw.QApplication(sys.argv)
    test = TestWindow()
    sys.exit(app.exec())