# Python functions as SPL operators

Toolkits > com.ibm.streamsx.topology 1.15.9 > com.ibm.streamsx.topology.python > Creating SPL Operators from Python code > Python functions as SPL operators

Decorating a Python function creates a stateless SPL operator. In SPL terms this is similar to an SPL Custom operator, where the code in the Python function is the custom code. For operators with input ports the function is called for each input tuple, passing a Python representation of the SPL input tuple. For a SPL source operator the function is called to obtain an iterable whose contents will be submitted to the output stream as SPL tuples.

Operator parameters are not supported.

An example SPL sink operator that prints each input SPL tuple after its conversion to a Python tuple.

    @spl.for_each()
    def PrintTuple(*tuple):
        "Print each tuple to standard out."
         print(tuple, flush=True)