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()

aula202-calculadora/main_window.py

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+from PySide6.QtWidgets import QMainWindow, QVBoxLayout, QWidget
+
+
+class MainWindow(QMainWindow):
+    def __init__(self, parent: QWidget | None = None, *args, **kwargs) -> None:
+        super().__init__(parent, *args, **kwargs)
+
+        # Configurando o layout básico
+        self.cw = QWidget()
+        self.v_layout = QVBoxLayout()
+        self.cw.setLayout(self.v_layout)
+        self.setCentralWidget(self.cw)
+
+        # Título da janela
+        self.setWindowTitle('Calculadora')
+
+    def adjustFixedSize(self):
+        # Última coisa a ser feita
+        self.adjustSize()
+        self.setFixedSize(self.width(), self.height())