How to use the qtawesome.font function in QtAwesome

animation=qta.Pulse(pulse_button))
        pulse_button.setIcon(pulse_icon)

        # Stacked spin icons
        stack_spin_button = QtWidgets.QPushButton('Stack spin')
        options = [{'scale_factor': 0.4,
                    'animation': qta.Spin(stack_spin_button)},
                   {'color': 'blue'}]
        stack_spin_icon = qta.icon('ei.asl', 'fa5.square',
                                   options=options)
        stack_spin_button.setIcon(stack_spin_icon)
        stack_spin_button.setIconSize(QtCore.QSize(32, 32))

        # Render a label with this font
        label = QtWidgets.QLabel(chr(0xf19c) + ' ' + 'Label')
        label.setFont(qta.font('fa', 16))

        # Layout
        vbox = QtWidgets.QVBoxLayout()
        widgets = [
            fa5_button,
            fa5s_button,
            fa5b_button,
            elusive_button, 
            mdi_button,
            music_button,
            rot_button,
            hflip_button,
            vflip_button,
            toggle_button,
            stack_button,
            saveall_button,