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https://issues.apache.org/jira/browse/BEAM-7746?focusedWorklogId=337016&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-337016
]
ASF GitHub Bot logged work on BEAM-7746:
----------------------------------------
Author: ASF GitHub Bot
Created on: 31/Oct/19 19:51
Start Date: 31/Oct/19 19:51
Worklog Time Spent: 10m
Work Description: chadrik commented on pull request #9056: [BEAM-7746]
Add python type hints
URL: https://github.com/apache/beam/pull/9056#discussion_r340904610
##########
File path: sdks/python/.pylintrc
##########
@@ -143,6 +143,7 @@ disable =
unnecessary-lambda,
unnecessary-pass,
unneeded-not,
+ unsubscriptable-object,
Review comment:
```python
class _ListBuffer(List[bytes]):
"""Used to support parititioning of a list."""
def partition(self, n):
# type: (int) -> List[List[bytes]]
return [self[k::n] for k in range(n)] # <------ ERROR HERE
```
```python
class SdfProcessSizedElements(DoOperation):
...
def progress_metrics(self):
# type: () -> beam_fn_api_pb2.Metrics.PTransform
with self.lock:
metrics = super(SdfProcessSizedElements, self).progress_metrics()
current_element_progress = self.current_element_progress()
if current_element_progress:
assert self.input_info is not None
metrics.active_elements.measured.input_element_counts[
self.input_info[1]] = 1 # <------ ERROR HERE
metrics.active_elements.fraction_remaining = (
current_element_progress.fraction_remaining)
return metrics
```
Generally speaking, there are a handful of checks that overlap between mypy
and pylint where pylint does a worse job. In the second example above,
`self.input_info` is an `Optional[Tuple]` that's initialized to `None`, so
pylint thinks it's unsubscriptable, but it's initialized to a tuple elsewhere
and there's a line just above the error that says `assert self.input_info is
not None`, so it obviously is in this context. These are all subtleties that
mypy understands but pylint does not, so I think we'll see a trend of moving
responsibility for these structural tests to mypy.
> Perhaps a newer version of pylint could help?
I'm already using the latest and greatest (one of the commits here ticks the
version up from 2.4.2 to 2.4.3)
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Issue Time Tracking
-------------------
Worklog Id: (was: 337016)
Time Spent: 16h 50m (was: 16h 40m)
> 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: 16h 50m
> 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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