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https://issues.apache.org/jira/browse/BEAM-722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15576336#comment-15576336
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Pablo Estrada commented on BEAM-722:
------------------------------------
I am working on adding this feature. I'm basically mirroring the way in which
we do this in Java, but trying to make it a bit more Pythonic. Here's a quick
example of how this would work:
{code:title=display_data_example.py|borderStyle=solid}
class MyParDo(beam.PTransform):
def display_data(self):
return {'disp_data_key': MyParDo,
'loneliest_number': 1,
'secret_url': {'value': 'awebsite.com', 'url':
'http://awebsite.com'} ,
'fn': {'value': self.fn, 'label': 'Display data of underlying DoFn'}
}
{code}
I'm renaming the populateDisplayData function to display_data, and instead of
using a builder, I return a dictionary of key:value pairs - and if a user wants
to specify more parameters than just the key:value, they can pass a dictionary
with them. Also, if the user passes as value an object that inherits from the
HasDisplayData class, then that object's display data will be included.
I have a [small
commit|https://github.com/pabloem/incubator-beam/commit/f3c7ebd24ecfd0b46aa4b2d6c906c4c1331fd13a]
that adds this. You can see some [examples in the few
unittests|https://github.com/pabloem/incubator-beam/commit/f3c7ebd24ecfd0b46aa4b2d6c906c4c1331fd13a#diff-74a8ae565b6cf2631423124a587c2beaR1].
If everyone is okay with this, I'll add comments, tests, and address feedback.
> Add Display Data to the Python SDK
> ----------------------------------
>
> Key: BEAM-722
> URL: https://issues.apache.org/jira/browse/BEAM-722
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py
> Reporter: Pablo Estrada
> Assignee: Frances Perry
>
> The DisplayData feature has been added to the Java SDK (see blog post
> announcing it:
> https://cloud.google.com/blog/big-data/2016/06/dataflow-updates-see-more-details-about-your-pipelines).
> We need now to add it to the Python SDK.
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