PyQt5 QButton, emoji and QDesktopServices.openUrl

button.py

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
from PyQt5.QtGui import QDesktopServices
from PyQt5.QtCore import pyqtSlot, QUrl

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Button demo")
        button = QPushButton('Click me \U0001F951', self)
        button.clicked.connect(self.on_click)

    @pyqtSlot()
    def on_click(self):
        print('PyQt5 button click')
        url = QUrl('http://example.com')
        QDesktopServices.openUrl(url)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())