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https://issues.apache.org/jira/browse/BEAM-7746?focusedWorklogId=372027&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-372027
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ASF GitHub Bot logged work on BEAM-7746:
----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Jan/20 00:11
Start Date: 15/Jan/20 00:11
Worklog Time Spent: 10m
Work Description: chadrik commented on pull request #10591: [BEAM-7746]
Silence a bunch of errors about "Cannot instantiate abstract class"
URL: https://github.com/apache/beam/pull/10591
abc.ABCMeta has been removed from this class with a fixme (BEAM-2685), which
means there' no longer any runtime checking of @abc.abstractmethod. However,
mypy still performs abc.abtractmethod/property checks even if a class does
not use abc.ABCMeta (this is a feature that lets you avoid using
metaclasses).
The problem arises because the beam code is doing a lot of dynamic patching
of
to_runner_api_parameter (see register_pickle_urn), which mypy cannot track,
so
it believes this method is missing.
We comment out @abc.abstractmethod, to disable the mypy checks (it's already
disabled at runtime by virtue of an earlier change to remove abc.ABCMeta).
We change the method to raise NotImplementedError to inform pylint not to
trust
its return value (None) and to get some degree of runtime checking.
This is a followup to #9056.
R: @robertwb
R: @udim
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 372027)
Time Spent: 52h 40m (was: 52.5h)
> 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: 52h 40m
> 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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