code: def attach(obj, schema):
    
  
    # We have a silly exception for lists, since they have no 'attach_schema'
    # method, and I don't feel like making a subclass for List just to add it.
    # So, we recursively search the list for tuples and attach the schema in
    # there.
    if framework.is_list(obj) and isinstance(schema, ListSchema):
      for x in obj:
        attach(x, schema.element_schema)
      return
  
    # Otherwise, the object should be able to handle its own schema attachment.
    getattr(obj, 'attach_schema', nop)(schema)
docs: Attach the given schema to the given object.