[
https://issues.apache.org/jira/browse/BEAM-8280?focusedWorklogId=433928&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-433928
]
ASF GitHub Bot logged work on BEAM-8280:
----------------------------------------
Author: ASF GitHub Bot
Created on: 15/May/20 21:27
Start Date: 15/May/20 21:27
Worklog Time Spent: 10m
Work Description: chadrik commented on a change in pull request #11070:
URL: https://github.com/apache/beam/pull/11070#discussion_r426054969
##########
File path: website/src/_posts/2020-03-06-python-typing.md
##########
@@ -0,0 +1,117 @@
+---
+layout: post
+title: "Python SDK Typing Changes"
+date: 2020-03-06 00:00:01 -0800
+excerpt_separator: <!--more-->
+categories: blog python typing
+authors:
+ - chadrik
+ - udim
+
+---
+<!--
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+TODO excerpt
+
+<!--more-->
+
+Python supports type annotations on functions (PEP 484). Static type checkers,
+such as mypy, are used to verify adherence to these types.
+For example:
+```py
+def f(v: int) -> int:
+ return v[0]
+```
+Running mypy on the above code will give the error:
+`Value of type "int" is not indexable`.
+
+We've recently made changes to Beam in 2 areas:
+
+Adding type hints throughout Beam. TODO expand
+
+Second, we've added support for Python 3 type annotations. This allows SDK
+users to specify a DoFn's type hints in one place.
+We've also expanded Beam's support of `typing` module types.
+
+For more background see:
+[Ensuring Python Type
Safety](https://beam.apache.org/documentation/sdks/python-type-safety/).
+
+# Beam Is Typed
+
+TODO
Review comment:
```suggestion
In tandem with the new type annotation support within DoFns, we've invested a
great deal of time adding type annotations to the Beam python code itself.
With this in place, we have begun using mypy, a static type
checker, as part of Beam's code review process, which ensures higher quality
contributions and fewer bugs.
The added context and insight that type annotations add throughout Beam is
useful for all Beam developers, contributors and end users alike, but
it is especially beneficial for developers who are new to the project.
If you use an IDE that understands type annotations, it will provide richer
type completions and warnings than before.
You'll also be able to use your IDE to inspect the types of Beam functions
and
transforms to better understand how they work, which will ease your own
development.
Finally, once Beam is fully annotated, end users will be able to benefit from
the use of static type analysis on their own pipelines and custom transforms.
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 433928)
Time Spent: 13h 40m (was: 13.5h)
> re-enable IOTypeHints.from_callable
> -----------------------------------
>
> Key: BEAM-8280
> URL: https://issues.apache.org/jira/browse/BEAM-8280
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Udi Meiri
> Assignee: Udi Meiri
> Priority: Major
> Fix For: 2.21.0
>
> Time Spent: 13h 40m
> Remaining Estimate: 0h
>
> See https://issues.apache.org/jira/browse/BEAM-8279
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