entering_values_by_keyboard_pie.py

import bpy
from bpy.types import Menu


class NewPie(Menu):
    bl_label = "Select Mode"
    bl_idname = 'kwanza'

    def draw(self, context):
        layout = self.layout

        active = context.active_object
        if active and active.type == 'MESH':
            mesh = active.data
            pie = layout.menu_pie()
            pie.row().prop(mesh, "auto_smooth_angle", text="Angle", slider=True)

addon_keymaps = []


def register():
    bpy.utils.register_class(NewPie)

    wm = bpy.context.window_manager
    kc = wm.keyconfigs.addon
    km = kc.keymaps.new('3D View', space_type='VIEW_3D', region_type='WINDOW')
    keymaps = km.keymap_items

    new_shortcut = keymaps.new("wm.call_menu_pie", "SEMI_COLON", "PRESS", shift=True)
    new_shortcut.properties.name = 'kwanza'
    addon_keymaps.append((km, new_shortcut))


def unregister():
    bpy.utils.unregister_class(NewPie)

    for km, shortcut in addon_keymaps:
        km.keymap_items.remove(shortcut)
    addon_keymaps.clear()


if __name__ == "__main__":
    register()