Zeppelin is not printing a Flink DataStream

If you are using %flink.pyflink or %flink as your interpreters, you will need to use the ZeppelinContext to visualize the results within the notebook.

%flink
// create a DataStream
val dataStream = senv.fromElements("Alice", "Bob", "John")

// interpret the insert-only DataStream as a Table
val inputTable = stenv.fromDataStream(dataStream)

z.show(inputTable, streamType="update")

For more PyFlink specific examples, see Query your data streams interactively using Kinesis Data Analytics Studio and Python.