[CentralOH] 2017-02-10 道場 Scribbles 落書/惡文? Part 1: EAFP; virtual environments; closure; put this in your pipe and smoke it; cowlishaw; Euler #104; trash calendar challenge; three step dance

[jep200404 at columbus.rr.com]

rr is choking on scribbles again, so binary sort to figure it out

busy night
had 9 folks, even without some of the regulars

We met in the "Community Room".

    Either that room's heat was fixed,
    or it was warm outside,
    or we generated enough heat,
    or our expectations were low enough,
    or some combination thereof.

EAFP

    doj at pan:~$ python3
    Python 3.6.0 |Anaconda 4.3.0 (32-bit)| (default, Dec 23 2016, 12:22:10)
    [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> float('1.234')
    1.234
    >>> float('1.234lkjsad')
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    ValueError: could not convert string to float: '1.234lkjsad'
    >>> try:
    ...     a = float('1.2398r2398')
    ... except ValueError:
    ...     print('do something else!')
    ... else:
    ...     print('good value is ', a)
    ...
    do something else!
    >>>

videos of good presentations, several of which were at PyOhio
Pyvideo.org
    Raymond Hettinger
        Beyond PEP 8 -- Best practices for beautiful intelligible code
        Keynote - What Makes Python Awesome
        Transforming Code into Beautiful, Idiomatic Python
    Brandon Rhodes
        Names, Objects, and Plummeting From The Cliff
        A Python Æsthetic: Beauty and Why I Python
        The Mighty Dictionary (#55)
        Python Design Patterns 1
        Python and the Glories of the UNIX Tradition
        Squinting at Python Objects
    Fernando Pérez
        Science And Python: retrospective of a (mostly) successful decade
    K Lars Lohn
        The Well Tempered API
            wp:Gödel, Escher, Bach
            wp:recursion
        Configman - the grand unified theorem of configuration
            good use of color in presentation

wp: prefix means Wikipedia
To get good answers, consider following the advice in the links below.
http://catb.org/~esr/faqs/smart-questions.html
http://web.archive.org/web/20090627155454/www.greenend.org.uk/rjk/2000/06/14/quoting.html

https://try.jupyter.org/

virtual environments are pretty much mandatory

python: python -m venv env
legacy python: virtualenv

conda
    miniconda
    anaconda

wp:Closure (computer programming)
    http://colug.net/python/cohpy/20150223/
    http://nbviewer.jupyter.org/url/colug.net/python/cohpy/20150223/cohpy-20150223-memoization.ipynb

https://github.com/cohpy/challenge-201605-generators/blob/master/james-prior/8-nested-generators-20160626-1920.ipynb

repeated repeated repeated repeated addition
    http://nbviewer.jupyter.org/github/cohpy/challenge-201605-generators/blob/master/james-prior/9-the-twelve-days-of-christmas.ipynb

http://nbviewer.jupyter.org/github/cohpy/challenge-201605-generators/blob/master/james-prior/5-dojo-20160429-2016-Mar-COhPy_Challenge_Rough-20160625-1612.ipynb
http://nbviewer.jupyter.org/github/cohpy/challenge-201605-generators/blob/master/james-prior/7-iter_date-revisited.ipynb

wp:Mike Cowlishaw
IBM feller
he was hot stuff there
    20% speed up in some OS release
did denser decimal software
    three decimal digits in 10 bits (pretty efficient)
    wp:Densely packed decimal
        wp:Chen–Ho encoding

Project Euler #104
    https://github.com/james-prior/euler/blob/master/euler-104-pandigital-fibonacci-ends-20170210.ipynb
    http://nbviewer.jupyter.org/github/james-prior/euler/blob/master/euler-104-pandigital-fibonacci-ends-20170210
someone else did euler #104
    used completely different techniques than above
    haskell
        was smoking fast at making fibonacci numbers
            (a million fibonacci numbers in under a second)
        was terribly slow at picking out first and last 9 digits
    javascript
        was slow at making fibonacci numbers
        was fast at getter first and last 9 digits
            wrote own math routines for extended precision
                did things in "giglets" inspired by Cowlishaw declets.
                    (9 digits fit in 30 bits which is within native int type)
    ???used hybrid approach???
    ???    haskell to make fibonacci numbers???
    ???    javascript to get first and last 9 digits???
    ???best time was about five minutes???

Challenge

Given a year, generate something like the following.
If no year specified, use current year.

    https://311.columbus.gov/2017%20Rotating%20Holiday%20Calendar.pdf
    https://311.columbus.gov/2017%20Recycling%20and%20Yard%20Waste%20Calendar.pdf
    https://www.columbus.gov/Templates/Detail.aspx?id=64633

See https://311.columbus.gov/AddrLookupnew.aspx

https://www.southernohioforestrally.com/

find -type f -exec ls -lad --full-time {} \; | sort -k6,7 | column -t -s ' '

wp:Ringling Bros. and Barnum & Bailey Circus
wp:Sells Floto Circus
http://www.zillow.com/homedetails/755-Dennison-Ave-Columbus-OH-43215/33845587_zpid/

three step dance

    ./configure
    make
    sudo make install

    http://tldp.org/LDP/LG/current/smith.html
    http://www.freetds.org/userguide/config.htm
    http://www.codecoffee.com/tipsforlinux/articles/27.html
    http://bochs.sourceforge.net/doc/docbook/user/compiling.html

otro baile
    Otros Aires
    Tanghetto
    Gotan Project
    Bajofondo