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https://issues.apache.org/jira/browse/BEAM-7746?focusedWorklogId=346311&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-346311
 ]

ASF GitHub Bot logged work on BEAM-7746:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 19/Nov/19 22:30
            Start Date: 19/Nov/19 22:30
    Worklog Time Spent: 10m 
      Work Description: chadrik commented on pull request #9915: [BEAM-7746] 
Add python type hints (part 1)
URL: https://github.com/apache/beam/pull/9915#discussion_r348203903
 
 

 ##########
 File path: sdks/python/apache_beam/runners/worker/bundle_processor.py
 ##########
 @@ -73,8 +108,17 @@
 class RunnerIOOperation(operations.Operation):
   """Common baseclass for runner harness IO operations."""
 
-  def __init__(self, name_context, step_name, consumers, counter_factory,
-               state_sampler, windowed_coder, transform_id, data_channel):
+  def __init__(self,
+               name_context,  # type: Union[str, common.NameContext]
+               step_name,
+               consumers,  # type: Mapping[Any, Iterable[operations.Operation]]
+               counter_factory,
+               state_sampler,
+               windowed_coder,  # type: coders.WindowedValueCoder
+               transform_id,  # type: str
+               data_channel  # type: data_plane.GrpcClientDataChannel
 
 Review comment:
   done. will be included in my upcoming review commit.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 346311)
    Time Spent: 25h 20m  (was: 25h 10m)

> Add type hints to python code
> -----------------------------
>
>                 Key: BEAM-7746
>                 URL: https://issues.apache.org/jira/browse/BEAM-7746
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-py-core
>            Reporter: Chad Dombrova
>            Assignee: Chad Dombrova
>            Priority: Major
>          Time Spent: 25h 20m
>  Remaining Estimate: 0h
>
> As a developer of the beam source code, I would like the code to use pep484 
> type hints so that I can clearly see what types are required, get completion 
> in my IDE, and enforce code correctness via a static analyzer like mypy.
> This may be considered a precursor to BEAM-7060
> Work has been started here:  [https://github.com/apache/beam/pull/9056]
>  
>  



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