[Bug]: Python Interactive Beam show() does not work

[Chenzo1001]

What happened?

While on the JupyterLab notebook cell:

import apache_beam as beam
from apache_beam import Create, Map
from apache_beam.runners.interactive.interactive_runner import InteractiveRunner
import apache_beam.runners.interactive.interactive_beam as ib

N=7
p = beam.Pipeline(InteractiveRunner())
squares = (p | "Create Elements" >> Create(range(N))
             | "Squares" >> Map(lambda x: x**2))

ib.show(squares)

The ib.show(squares) does not show anything except:
Processing... show

But if you run:

squares = (p | "Create Elements" >> Create(range(N))
             | "Squares" >> Map(lambda x: x**2)
             | Map(print))
p.run()

Then it will show the correct result:

0
1
4
9
16
25
36

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

Issue Components

• Component: Python SDK
• Component: Java SDK
• Component: Go SDK
• Component: Typescript SDK
• Component: IO connector
• Component: Beam YAML
• Component: Beam examples
• Component: Beam playground
• Component: Beam katas
• Component: Website
• Component: Infrastructure
• Component: Spark Runner
• Component: Flink Runner
• Component: Samza Runner
• Component: Twister2 Runner
• Component: Hazelcast Jet Runner
• Component: Google Cloud Dataflow Runner

[Chenzo1001]

.take-issue