Calculadora - Criando a janela principal com QMainWindow, QWidget e QVBoxLayout

aula202-calculadora/main.py

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+import sys
+
+from main_window import MainWindow
+from PySide6.QtWidgets import QApplication, QLabel
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    window = MainWindow()
+
+    label1 = QLabel('O meu texto')
+    label1.setStyleSheet('font-size: 150px;')
+    window.v_layout.addWidget(label1)
+    window.adjustFixedSize()
+
+    window.show()
+    app.exec()