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https://issues.apache.org/jira/browse/BEAM-7746?focusedWorklogId=348316&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-348316
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ASF GitHub Bot logged work on BEAM-7746:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 22/Nov/19 19:41
            Start Date: 22/Nov/19 19:41
    Worklog Time Spent: 10m 
      Work Description: robertwb commented on pull request #9915: [BEAM-7746] 
Add python type hints (part 1)
URL: https://github.com/apache/beam/pull/9915#discussion_r349757301
 
 

 ##########
 File path: sdks/python/apache_beam/transforms/window.py
 ##########
 @@ -367,7 +381,10 @@ class FixedWindows(NonMergingWindowFn):
       range.
   """
 
-  def __init__(self, size, offset=0):
+  def __init__(self,
+               size,  # type: Union[int, float, Duration]
 
 Review comment:
   Maybe make this into a named type? (Similarly for the Timestamp one.)
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 348316)
    Time Spent: 28h 10m  (was: 28h)

> 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: 28h 10m
>  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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