[
https://issues.apache.org/jira/browse/BEAM-5878?focusedWorklogId=288338&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-288338
]
ASF GitHub Bot logged work on BEAM-5878:
----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Aug/19 00:19
Start Date: 03/Aug/19 00:19
Worklog Time Spent: 10m
Work Description: lazylynx commented on pull request #9237: [BEAM-5878]
support DoFns with Keyword-only arguments
URL: https://github.com/apache/beam/pull/9237
support DoFns with Keyword-only arguments in Python 3 and add test reverted
in #8750 with no syntax error in Python 2
tests condition are fixed as follows due to errors:
##### test_side_input_keyword_only_args
```
result2 = pcol | 'compute2' >> beam.FlatMap(
sort_with_side_inputs,
beam.pvalue.AsIter(side))
```
to
```
result2 = pcol | 'compute2' >> beam.FlatMap(
sort_with_side_inputs,
beam.pvalue.AsList(side))
```
##### test_combine_keyword_only_args
```
assert_that(result2, equal_to([23]), label='assert2')
```
to
```
assert_that(result2, equal_to([49]), label='assert2')
```
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 288338)
Time Spent: 5h 10m (was: 5h)
> Support DoFns with Keyword-only arguments in Python 3.
> ------------------------------------------------------
>
> Key: BEAM-5878
> URL: https://issues.apache.org/jira/browse/BEAM-5878
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-py-core
> Reporter: Valentyn Tymofieiev
> Assignee: yoshiki obata
> Priority: Minor
> Fix For: 2.16.0
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> Python 3.0 [adds a possibility|https://www.python.org/dev/peps/pep-3102/] to
> define functions with keyword-only arguments.
> Currently Beam does not handle them correctly. [~ruoyu] pointed out [one
> place|https://github.com/apache/beam/blob/a56ce43109c97c739fa08adca45528c41e3c925c/sdks/python/apache_beam/typehints/decorators.py#L118]
> in our codebase that we should fix: in Python in 3.0 inspect.getargspec()
> will fail on functions with keyword-only arguments, but a new method
> [inspect.getfullargspec()|https://docs.python.org/3/library/inspect.html#inspect.getfullargspec]
> supports them.
> There may be implications for our (best-effort) type-hints machinery.
> We should also add a Py3-only unit tests that covers DoFn's with keyword-only
> arguments once Beam Python 3 tests are in a good shape.
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