Add new example

Author: lpozo

pyqt-calculator-tutorial/examples/signal_slots.py

@@ -0,0 +1,34 @@
+"""Signals and slots example."""
+
+import sys
+
+from PyQt6.QtWidgets import (
+    QApplication,
+    QLabel,
+    QPushButton,
+    QVBoxLayout,
+    QWidget,
+)
+
+
+def greet():
+    if msgLabel.text():
+        msgLabel.setText("")
+    else:
+        msgLabel.setText("Hello World!")
+
+
+app = QApplication([])
+window = QWidget()
+window.setWindowTitle("Signals and slots")
+layout = QVBoxLayout()
+
+button = QPushButton("Greet")
+button.clicked.connect(greet)
+
+layout.addWidget(button)
+msgLabel = QLabel("")
+layout.addWidget(msgLabel)
+window.setLayout(layout)
+window.show()
+sys.exit(app.exec())