menu_sample.py

# 2.8+ Update for https://gist.github.com/sambler/6d1fdee82878811c75ac

import bpy

class CustomMenu(bpy.types.Menu):
    """Demo custom menu"""
    # example menu from Templates->Python->ui_menu.py
    bl_label = "Custom Menu"
    bl_idname = "OBJECT_MT_custom_menu"

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

        layout.operator("wm.open_mainfile")
        layout.operator("wm.save_as_mainfile").copy = True

        layout.operator("object.shade_smooth")

        layout.label(text="Hello world!", icon='WORLD_DATA')

        # use an operator enum property to populate a sub-menu
        layout.operator_menu_enum("object.select_by_type",
                                  property="type",
                                  text="Select All by Type...",
                                  )

        # call another menu
        layout.operator("wm.call_menu", text="Unwrap").name = "VIEW3D_MT_uv_map"

class LayoutPanel(bpy.types.Panel):
    bl_label = "Demo layout"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOLS"
    bl_region_type = "UI"
    bl_category = "Tools"
    bl_context = "objectmode"   


    def draw(self, context):
        layout = self.layout
        self.layout.operator("object.mode_set", text='Edit', icon='EDITMODE_HLT').mode='EDIT'

        layout.label(text="Some Operators")
        row = layout.row(align=True)
        row.alignment = 'EXPAND'
        row.operator("object.mode_set", text="Button1", icon='OBJECT_DATAMODE').mode='OBJECT'
        row.operator("object.mode_set", text="Button2", icon='SCULPTMODE_HLT').mode='SCULPT'
        row.operator("object.mode_set", text="Button3", icon='TPAINT_HLT').mode='TEXTURE_PAINT'

        row = layout.row()
        box = row.box()

        row = box.row()
        row.label(text="Some menus", icon='LINENUMBERS_ON')

        row = box.row()
        # add the custom menu defined above
        box.menu(CustomMenu.bl_idname, text='My custom menu', icon='CANCEL')

        row = box.row()
        # add a standard blender menu - the add menu
        box.menu('RENDER_MT_framerate_presets', text='Add', icon='EDITMODE_HLT')

        row = box.row()
        # add an enum property menu
        # this allows only certain values to be set for a property
        box.prop_menu_enum(context.scene, 'test_enum', text='enum property', icon='NLA')


enum_menu_items = [
                ('OPT1','Option 1','',1),
                ('OPT2','Option 2','',2),
                ('OPT3','Option 3','',3),
                ('OPT4','Option 4','',4),
                ]

def register():
    bpy.types.Scene.test_enum = bpy.props.EnumProperty(items=enum_menu_items)
    bpy.utils.register_class(CustomMenu)
    bpy.utils.register_class(LayoutPanel)

def unregister():
    bpy.utils.unregister_class(LayoutPanel)
    bpy.utils.unregister_class(CustomMenu)
    del bpy.types.Scene.test_enum


if __name__ == "__main__":
    register()