aaltay commented on a change in pull request #11020: [BEAM-7926] Update Data 
Visualization
URL: https://github.com/apache/beam/pull/11020#discussion_r387257783
 
 

 ##########
 File path: sdks/python/apache_beam/runners/interactive/interactive_beam.py
 ##########
 @@ -86,10 +85,57 @@ def capture_duration(self, value):
       # The next PCollection evaluation will capture fresh data from sources,
       # and the data captured will be replayed until another eviction.
     """
+    assert value.total_seconds() > 0, 'Duration must be a positive value.'
     self.capture_control._capture_duration = value
 
   # TODO(BEAM-8335): add capture_size options when they are supported.
 
+  @property
+  def display_timestamp_format(self):
+    """The format in which timestamps are displayed.
+
+    Default is '%Y-%m-%d %H:%M:%S.%f%z', e.g. 2020-02-01 15:05:06.000015-08:00.
 
 Review comment:
   Where is the default defined?
   
   If defined somewhere else, let's not repeat these in comments. It will 
require sync both places going forward.

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