[builtins.python] Capture Display Updates

[rgbkrk]

When running code that does display updates, captured output will show each individual result in the output pane:

However, we really just need to take the last of a displayed item. For example, captured outputs will have the keys transient and update. Transient will contain the display id to group on like {'display_id': '9123d4e517b11d15'} while update will be True or False.