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https://issues.apache.org/jira/browse/BEAM-12340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549302#comment-17549302
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Danny McCormick commented on BEAM-12340:
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This issue has been migrated to https://github.com/apache/beam/issues/20907
> Document: _namespace is a reserved field for DoFns (used for display data)
> --------------------------------------------------------------------------
>
> Key: BEAM-12340
> URL: https://issues.apache.org/jira/browse/BEAM-12340
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core, website
> Reporter: Ahmet Altay
> Priority: P3
>
> User reported issue when _namespace is not used for display data:
> > self._populate_items(display_data_dict)
> > File third_party/py/apache_beam/transforms/display.py", line 117, in
> > _populate_items
> > element._namespace(), element.display_data())
> > TypeError: 'str' object is not callable
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