[Baypiggies] Reminder: Introducing Type Annotations for Python TOMORROW (Thursday)

William Deegan bdbaddog at gmail.com
Fri Dec 16 17:14:20 EST 2016

I'll annotate the baypiggies.net page for the meeting with the links.
Also a note for all. I've been adding links to each meetings videos to
their baypiggies.net pages when they are posted
(And I notice.. or am notified).


On Fri, Dec 16, 2016 at 6:01 AM, Guido van Rossum <guido at python.org> wrote:

> Thanks everyone for showing up last night despite the rain!
> Here are the slides we used:
> https://www.dropbox.com/s/6guh91lixacsyr7/Mypy%20Baypiggies.pdf?dl=0
> Here is David's Bank example (unannotated, with bugs):
> https://www.dropbox.com/s/9cqxm2k5o75ddo8/demo.py?dl=0
> Hopefully the video recording will come online soon.
> As a reminder, use "pip install mypy-lang" -- the trailing "-lang" is
> important!
> --Guido
> On Wed, Dec 14, 2016 at 11:30 AM, Glen Jarvis <glen at glenjarvis.com> wrote:
>> Because of the holidays, this is a week earlier than normal. It's
>> tomorrow:
>> Also, remember, we're at a new location:
>> LinkedIn, Yosemite Room
>> 605 W. Maude Ave, Sunnyvale, CA
>> Please RSVP to make our lives easier:
>> https://www.meetup.com/BAyPIGgies/events/232817503/
>> Dropbox has several million lines of production code written in Python
>> 2.7. As a first step towards migrating to Python 3, as well as to generally
>> make our code more navigable, we are annotating our code with type
>> annotations using the PEP 484 standard and type-checking the annotated code
>> with mypy. In this talk we will discuss lessons learned and show how you
>> too can start type-checking your legacy Python 2.7 code, one file at a
>> time. We will also describe some of the many improvements we’ve made to
>> mypy in the process, as well as some other tools that come in handy.
>> Mypy is an open-source type-checker for Python. It was originally created
>> by one of the speakers, Jukka Lehtosalo, in support of his PhD thesis,
>> before he joined Dropbox. Mypy supports the PEP 484 standard for gradual
>> typing in Python. It supports Python 3.2 and higher, as well as Python 2.7
>> (using function signatures in type comments, per a recent update to PEP
>> 484).
>> Guido van Rossum is the author of the Python programming language. He
>> continues to serve as the "Benevolent Dictator For Life" (BDFL), meaning
>> that he continues to oversee the Python development process, making
>> decisions where necessary. He is currently employed by Dropbox.
>> (Based in UK and may not be able to attend)
>> Jukka Lehtosalo created mypy, an optional static type checker for Python,
>> while working on his PhD at the University of Cambridge. He currently works
>> at Dropbox and continues to lead the development of mypy.
>> Greg Price is an engineer at Dropbox. Previously he worked at Quora and
>> helped Ksplice make rebooting obsolete.
>> David Fisher works full time on mypy (the PEP 484 static type checker) at
>> Dropbox. He enjoys learning esoteric languages in his spare time.
>> _______________________________________________
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> --
> --Guido van Rossum (python.org/~guido)
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