finally UserHandler ( RequestHandler ) :
    @ web_adaptor
    def post ( self , * args , ** kwargs ) :
        self . validate_content_type ( )
        params = self . get_http_body ( )
        self . finish ( UserController ( ) . login ( params ) )

class UserHandler ( RequestHandler ) :
    @ web_adaptor
    def post ( self , * args , ** kwargs ) :
        self . validate_content_type ( )
        params = self . get_http_body ( )
        self . finish ( UserController ( ) . login ( params ) )

次に示すpythonコードの誤りを修正しなさい。