[Blender Python] Import a FBX model into the scene (vidoe explination https://www.skool.com/cgpython/make-a-button-to-add-a-model?p=abc92a32)

simple_import_fbx_op.py

import bpy


class SimpleImportFBXOperator(bpy.types.Operator):
    bl_idname = "import_scene.custom_fbx"
    bl_label = "Import FBX Model"

    def execute(self, context):
        # WARNING: This is just an example path, please don't use hardcoded paths in production add-ons!
        # Consider this more advanced solution https://gist.github.com/CGArtPython/f2b3759e27ba1b0eca112c528ebdf1c9
        file_path = "E:\\blender_asset_lib\\man.fbx"
        bpy.ops.import_scene.fbx(filepath=file_path)
        return {'FINISHED'}


class VIEW3D_PT_my_custom_panel(bpy.types.Panel):  # class naming convention ‘CATEGORY_PT_name’

    # where to add the panel in the UI
    bl_space_type = "VIEW_3D"  # 3D Viewport area (find list of values here https://docs.blender.org/api/current/bpy_types_enum_items/space_type_items.html#rna-enum-space-type-items)
    bl_region_type = "UI"  # Sidebar region (find list of values here https://docs.blender.org/api/current/bpy_types_enum_items/region_type_items.html#rna-enum-region-type-items)

    bl_category = "My Custom Panel category"  # found in the Sidebar
    bl_label = "My Custom Panel label"  # found at the top of the Panel

    def draw(self, context):
        """define the layout of the panel"""
        row = self.layout.row()
        row.operator("import_scene.custom_fbx", text="Add Man")



def register():
    bpy.utils.register_class(SimpleImportFBXOperator)
    bpy.utils.register_class(VIEW3D_PT_my_custom_panel)


def unregister():
    bpy.utils.unregister_class(VIEW3D_PT_my_custom_panel)
    bpy.utils.unregister_class(SimpleImportFBXOperator)


if __name__ == "__main__":
    register()