Re: Python teacher notes, preparing for class...

On Monday, August 27, 2018, kirby urner <[email protected]> wrote:

>
> My flight plan for sharing Python this evening, adult audience, real time
> in cyberspace, includes going backstage to survey the Python for Developers
> view.
>
> That will mean optionally cloning the Github site that's mainly a Sphinx
> HTML document about how to participate in Python's evolution.
>
> https://github.com/python/devguide  (show how Sphinx works)
>

ReadTheDocs might be a helpful segue from Sphinx and the devguide.
https://github.com/rtfd/readthedocs-docker-images/blob/master/README.rst#usage

$ docker pull readthedocs/build:latest

(Building a PDF with Sphinx requires installing a lot of LaTeX packages)

https://github.com/yoloseem/awesome-sphinxdoc

cookiecutter-pypackage has a good Sphinx template that extends the one
generated by sphinx-quickstart with e.g. how to include README.rst in the
Sphinx docs and the package long_description in setup.py (with cool badges)
https://cookiecutter.readthedocs.io/en/latest/readme.html#available-cookiecutters

https://packaging.python.org


>
> I don't plan on actually compiling Python tonight, but we'll be right
> where one needs to be to learn how.  Just looking at the issues tracker
> (first time) and PEPs (again) will inspire students with how well-oiled a
> machine is the Python "sausage making" factory.
>
> In my estimation, a well-rounded knowledge of Python includes
> understanding how to make one's own decorators and context managers.
>
> The following categories of type should also be made clear:
>
> * Mutable vs Immutable
> * Callable vs not
> * Collections: Sequences vs Mappings
> * Iterator vs Iterable
> * Generator as Iterator
> * Context Manager
> * Descriptor
>
> We recognize these types based on the assortment of "__ribs__" (special
> names) they contain e.g. callables have __call__, mutables support
> __setitem__, iterators have __next__, context managers __enter__ and
> __exit__, Descriptors __fget__, __fset__ and so on.  We're like bird
> watcher with binoculars, identifying species based on these tell-tale
> characteristics (APIs.
>

This is the most unified reference on __dunder_methods__ ('magic methods')
I've ever seen:
"A Guide to Python's Magic Methods"
https://rszalski.github.io/magicmethods/


>
> A grand synthesis involves using the @contextmanager decorator from
> contextlib to turn a generator into a context manager.  That's a high point
> (summit) in my curriculum.
>
> The Descriptor concept works in tandem with decorator syntax to bring us
> the @property type.  I use a "magic circle" type for properties, meaning
> you can set radius or circumference or area of a Circle, and the other two
> attributes reset automatically.  I believe Raymond Hettinger uses the same
> approach.
>

ipywidgets (and IPython) are built atop traitlets (which are like
properties with event handlers that are observable)
https://ipywidgets.readthedocs.io/en/stable/examples/Widget%20Events.html#Traitlet-events

> Widget properties are IPython traitlets and traitlets are eventful. To
handle changes, the observe method of the widget can be used to register a
callback.


>
> One of my most computer sciency types is the Permutation class, with many
> soft links to Group Theory.  My P class randomly generates a dict with
> [a-z] plus space (' ') mapped to the same set, keys to values in a
> different order.  I have voluminous writings on how one might use this
> class to explore elementary group theory on math-teach @ Math Forum, public
> archives, no longer open to new comments.
>
> https://repl.it/@kurner/Permutations
> http://mathforum.org/kb/message.jspa?messageID=10227508
> https://github.com/4dsolutions/Python5/blob/master/Permutations.ipynb
>
> Kirby
>
>

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