[CentralOH] 2016-07-25 會議 Scribbles 落書/惡文?: pyohio.org Cristina Videira Lopes' "Exercises in Programming Style" travis risner regex automate the boring stuff al sweigart niel ludban numpy scipy ufuncs sinc stem plot convolution

[jep200404 at columbus.rr.com]

Thanks again to Pillar and Chris Baker for hosting us at The Forge
with plenty of food and beverages.

Chris bought a 12' HDMI cable from Microcenter. It was the longest they had.

PyOhio is this weekend.
Go to pyohio.org to register.
Jan is T-shirt chair
PyOhio has some extra tee-shirts that they will sell off

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Chris Baker talked a bit about the most interesting recent Python thing to him.
Cristina Videira Lopes' "Exercises in Programming Style"
book and Curry on presentation.
The code is on github.

Exercises in Programming Style
http://www.ebooks.com/1520809/exercises-in-programming-style/lopes-cristina-videira/
    ebook is PDF
http://www.curry-on.org/
    https://www.youtube.com/watch?v=JlPMOszyjjo

word counting https://www.ics.uci.edu/~lopes/
https://www.ics.uci.edu/~lopes/https://github.com/christa
https://github.com/crista/programming-conference.github.io
https://github.com/crista/exercises-in-programming-style

https://gist.github.com/folkengine/ce0eeb843c2791db44af46877a2bdc6f

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18:43-~19:30 travis risner presentation on regexes

use regex objects as keys in a dictionary
play_firewall_config.txt
PlayParse.py

presentation based on examples from 
    Automate the Boring Stuff by Al Sweigart
        dojo has a copy of this
    https://automatetheboringstuff.com/
    http://inventwithpython.com/

    http://pyvideo.org/video/3692/automating-your-browser-and-desktop-apps
    Al gave the keynote at last year's PyOhio.

https://github.com/deeppunster/RegEx101

None did not show up in Jupyter notebook

    Travis worked around that indirectly with 
        print(mo3 == None)
        in cell #8 from
        http://nbviewer.jupyter.org/github/deeppunster/RegEx101/blob/master/RegEx 101 with answers.ipynb

    https://github.com/james-prior/RegEx101/commit/b8154371a155c8d7812e5e54daa1ddcd36a77f78

I need to:

    Need to make a little notebook about how to show None
    Also compare to Python prompt and standalone program.

    >>> repr('\n')
    versus
    repr('\n') in Jupyter Notebook
    versus
    standalone program

.findall() is interesting

regex = r'.at' matches 'at This that and the other.' starting at 10, not 0

to serve man

    wp:To Serve Man

Nesting in monster verbose regex was hard to follow,
so use indentation to indicate nesting (like Python does).

    https://github.com/james-prior/RegEx101/commit/33a457050636bdf1423aa0c04973f89deef87773

Show pictures of recommended book covers with links.

    Automate the Boring Stuff

    Mastering Regular Expressions by Jeffrey Friedl

premature optimization is the root of all evil

emacs versus vi
https://www.xkcd.com/378/ Real Programmers

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19:37 Niel Ludban

1999-2000 first Python

https://bitbucket.org/nludban/
https://bitbucket.org/nludban/cohpy-20160725-sigproc
    Pretty rendering.
    will show up in a couple of days
    need to distinguish input from output
        Jupyter Notebook makes that easy

Forgot to ask what he thinks of bitbucket.org versus github

this presentation is to show off numpy and scipy
numpy and scipy are based on MATLAB
    smells like fortran in some places
ufuncs 
    http://docs.scipy.org/doc/numpy/reference/ufuncs.html

stem plot to show emphasize (under)sampling

    http://matplotlib.org/examples/pylab_examples/stem_plot.html

sinc function
    wp:Sinc function
    only multiple of π that yields non-zero output is 0.
sinc versus delta

wp:Euler's identity
j=sqrt(-1)
    eighth roots of i?

Python ses "j" instead of "i" for square root of -1
to reduce accidents with the common variable name
    That's common in electrical engineering.
    https://en.wikipedia.org/wiki/Complex_numbers#Notation

wp:Convolution
    used for pattern matching

    man on bicycle with fish shroud pictures
        standard 
        hard to find image on internet
            http://www.phrases.org.uk/images/fish-bicycle.jpg
            https://fishandbicylces.files.wordpress.com/2012/06/bicycles-7.jpg