udim commented on a change in pull request #11070: [BEAM-8280] Blog post: Python typing changes URL: https://github.com/apache/beam/pull/11070#discussion_r395826290
########## 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: So, no immediate rush. We are also adjusting to WFH ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
