duplicate_unparent.py

import bpy


class DuplicateAndUnparent(bpy.types.Operator):
    """Tooltip"""
    bl_idname = "object.duplicate_and_unparent"
    bl_label = "Duplicate And Unparent"

    @classmethod
    def poll(cls, context):
        return context.active_object is not None

    def execute(self, context):
        bpy.ops.object.duplicate_move()
        bpy.ops.object.parent_clear(type='CLEAR')
        bpy.ops.transform.translate('INVOKE_DEFAULT')
        return {'FINISHED'}


def register():
    bpy.utils.register_module(__name__)


def unregister():
    bpy.utils.unregister_module(__name__)


if __name__ == "__main__":
    register()