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https://issues.apache.org/jira/browse/BEAM-7746?focusedWorklogId=369602&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-369602
]
ASF GitHub Bot logged work on BEAM-7746:
----------------------------------------
Author: ASF GitHub Bot
Created on: 10/Jan/20 04:05
Start Date: 10/Jan/20 04:05
Worklog Time Spent: 10m
Work Description: chadrik commented on pull request #10367: [BEAM-7746]
Add python type hints (part 2)
URL: https://github.com/apache/beam/pull/10367#discussion_r364988919
##########
File path: sdks/python/apache_beam/pipeline.py
##########
@@ -808,7 +810,7 @@ class AppliedPTransform(object):
def __init__(self,
parent,
- transform, # type: ptransform.PTransform
+ transform, # type: Optional[ptransform.PTransform]
Review comment:
in `Pipeline.__init__`:
```python
# Stack of transforms generated by nested apply() calls. The stack will
# contain a root node as an enclosing (parent) node for top transforms.
self.transforms_stack = [AppliedPTransform(None, None, '', None)]
```
Best way to deal with this may be a special `RootAppliedTransform` subclass.
---
It can also possibly be `None` in `AppliedPTransform.from_runner_api()`:
```python
transform = ptransform.PTransform.from_runner_api(proto.spec, context)
result = AppliedPTransform(
parent=None,
transform=transform,
full_label=proto.unique_name,
inputs=main_inputs)
```
This is because `PTransform.from_runner_api()` returns `Optional[PTransform]`
```python
@classmethod
def from_runner_api(cls,
proto, # type:
Optional[beam_runner_api_pb2.FunctionSpec]
context # type: PipelineContext
):
# type: (...) -> Optional[PTransform]
if proto is None or not proto.urn:
return None
parameter_type, constructor = cls._known_urns[proto.urn]
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 369602)
Time Spent: 46h 20m (was: 46h 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: 46h 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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