bl_info = {
    "name": "Swap Resulotion",
    "blender": (2, 80, 0),
    "category": "Context",
}

import bpy

class SwapResolution(bpy.types.Operator):
    """Resolution Swaping button"""      # Use this as a tooltip for menu items and buttons.
    bl_idname = "scene.swap_res"        # Unique identifier for buttons and menu items to reference.
    bl_label = "Swap Resolution"         # Display name in the interface.

    
    def swap(self, curr_x, curr_y):
        y = curr_x
        x = curr_y
        bpy.context.scene.render.resolution_y = y
        bpy.context.scene.render.resolution_x = x

    def execute(self, context):        # execute() is called when running the operator.
        # The original script
        render = context.scene.render
        self.swap(render.resolution_x, render.resolution_y)

        return {'FINISHED'}            # Lets Blender know the operator finished successfully.
    
class FancyPanel(bpy.types.Panel):
    bl_idname = "test_fancy_panel_for_fun"
    bl_label = "Fancy Panel"
    bl_space_type = 'PROPERTIES'
    bl_region_type = "WINDOW"

    def draw(self, context):
        self.layout.laber(text="Testing")
        self.layout.operator("scene.swap_res")

def register():
    bpy.utils.register_class(SwapResolution)
    bpy.utils.register_class(FancyPanel)
    # bpy.types.VIEW3D_MT_object.append(menu_func)  # Adds the new operator to an existing menu.

def unregister():
    bpy.utils.unregister_class(SwapResolution)
    bpy.utils.unregister_class(FancyPanel)
    
if __name__ == "__main__":
    register()