From gslindstrom at gmail.com  Wed Nov  2 21:14:59 2011
From: gslindstrom at gmail.com (Greg Lindstrom)
Date: Wed, 2 Nov 2011 15:14:59 -0500
Subject: [PyAR2] Car Talk Puzzler (The Hall of Lights)
Message-ID: <CAF8U9yzkJ48=JOsYhaLmo6A0O-EaVDgrVCoRgeFCfkuG20Lw0g@mail.gmail.com>

The Car Talk "Puzzler" this week is a classic (I've heard it
opening/closing lockers):

*RAY:* This puzzler is from my "ceiling light" series. Imagine, if you
will, that you have a long, long corridor that stretches out as far as the
eye can see. In that corridor, attached to the ceiling are lights that are
operated with a pull cord.

There are gazillions of them, as far as the eye can see. Let's say there
are 20,000 lights in a row.

They're all off. Somebody comes along and pulls on each of the chains,
turning on each one of the lights. Another person comes right behind, and
pulls the chain on every second light.

*TOM:* Thereby turning off lights 2, 4, 6, 8 and so on.

*RAY:* Right. Now, a third person comes along and pulls the cord on every
third light. That is, lights number 3, 6, 9, 12, 15, etcetera. Another
person comes along and pulls the cord on lights number 4, 8, 12, 16 and so
on. Of course, each person is turning on some lights and turning other
lights off.

If there are 20,000 lights, at some point someone is going to come skipping
along and pull every 20,000th chain.

When that happens, some lights will be on, and some will be off. Can you
predict which lights will be on?

I wrote a Python program to "solve" this is 8 (non-blank) lines long,
including one line, "MAX_LIGHTS = 20000" used to adjust the number of
lights for debugging/testing.  Let's see how YOU would do it (I'll post
mine in a couple days).

O'Reilly accidentally sent me an "extra" case of books to give away at
PyArkansas (the arrived after the conference).  If Marsee will let me give
them away, the entry judged "best" will win one of the titles.  "Best" is
totally subjective but will include (1) Correct Solution and (2) Elegance
(is it Pythonic/Understandable?).  Python 2 or 3.

--greg
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From waynejwerner at gmail.com  Thu Nov  3 19:33:42 2011
From: waynejwerner at gmail.com (Wayne Werner)
Date: Thu, 3 Nov 2011 13:33:42 -0500
Subject: [PyAR2] Car Talk Puzzler (The Hall of Lights)
In-Reply-To: <CAF8U9yzkJ48=JOsYhaLmo6A0O-EaVDgrVCoRgeFCfkuG20Lw0g@mail.gmail.com>
References: <CAF8U9yzkJ48=JOsYhaLmo6A0O-EaVDgrVCoRgeFCfkuG20Lw0g@mail.gmail.com>
Message-ID: <CAPM86NeyRujMB2BLirQ-pebZjNHB7aasV3rBa8pqn8PoaWF4gw@mail.gmail.com>

On Wed, Nov 2, 2011 at 3:14 PM, Greg Lindstrom <gslindstrom at gmail.com>wrote:

>
> I wrote a Python program to "solve" this is 8 (non-blank) lines long,
> including one line, "MAX_LIGHTS = 20000" used to adjust the number of
> lights for debugging/testing.  Let's see how YOU would do it (I'll post
> mine in a couple days).
>

Using MAXLIGHTS, I've got in 6 lines - one of those is to actually display
the output. After searching to confirm my answers were correct, I also came
up with an extremely short one-liner - You'd have to use two lines in
Python 2, though.

-Wayne
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From ccn at panix.com  Thu Nov  3 19:17:25 2011
From: ccn at panix.com (Chris Nestrud)
Date: Thu, 3 Nov 2011 14:17:25 -0400
Subject: [PyAR2] Car Talk Puzzler (The Hall of Lights)
In-Reply-To: <CAF8U9yzkJ48=JOsYhaLmo6A0O-EaVDgrVCoRgeFCfkuG20Lw0g@mail.gmail.com>
References: <CAF8U9yzkJ48=JOsYhaLmo6A0O-EaVDgrVCoRgeFCfkuG20Lw0g@mail.gmail.com>
Message-ID: <b84af74cae15cbbb77f163b31fe9d3b3.squirrel@mail.panix.com>

Here's the method that I used to initially solve the problem.

#Begin
from collections import defaultdict
max_lights = 20000
lights=defaultdict(bool) # defaults to False
for i in xrange(1,max_lights+1,1):
    for j in xrange(i,max_lights+1,i):
        lights[j] = not lights[j]
print("Lights on: %s" % (', '.join((str(l) for l in
xrange(1,max_lights+1,1) if lights[l]))))
#End

Here's the method after realizing the pattern.

#Begin
from math import sqrt
max_lights = 20000
print("Lights on: %s" % (', '.join((str(l*l) for l in
xrange(1,int(sqrt(max_lights)+1),1)))))
#End

I'm going for minimum number of lines rather than "Readability counts."

Chris

Greg Lindstrom wrote:
> The Car Talk "Puzzler" this week is a classic (I've heard it
> opening/closing lockers):
>
> *RAY:* This puzzler is from my "ceiling light" series. Imagine, if you
> will, that you have a long, long corridor that stretches out as far as the
> eye can see. In that corridor, attached to the ceiling are lights that are
> operated with a pull cord.
>
> There are gazillions of them, as far as the eye can see. Let's say there
> are 20,000 lights in a row.
>
> They're all off. Somebody comes along and pulls on each of the chains,
> turning on each one of the lights. Another person comes right behind, and
> pulls the chain on every second light.
>
> *TOM:* Thereby turning off lights 2, 4, 6, 8 and so on.
>
> *RAY:* Right. Now, a third person comes along and pulls the cord on every
> third light. That is, lights number 3, 6, 9, 12, 15, etcetera. Another
> person comes along and pulls the cord on lights number 4, 8, 12, 16 and so
> on. Of course, each person is turning on some lights and turning other
> lights off.
>
> If there are 20,000 lights, at some point someone is going to come
> skipping
> along and pull every 20,000th chain.
>
> When that happens, some lights will be on, and some will be off. Can you
> predict which lights will be on?
>
> I wrote a Python program to "solve" this is 8 (non-blank) lines long,
> including one line, "MAX_LIGHTS = 20000" used to adjust the number of
> lights for debugging/testing.  Let's see how YOU would do it (I'll post
> mine in a couple days).
>
> O'Reilly accidentally sent me an "extra" case of books to give away at
> PyArkansas (the arrived after the conference).  If Marsee will let me give
> them away, the entry judged "best" will win one of the titles.  "Best" is
> totally subjective but will include (1) Correct Solution and (2) Elegance
> (is it Pythonic/Understandable?).  Python 2 or 3.
>
> --greg
> _______________________________________________
> PyAR2 mailing list
> PyAR2 at python.org
> http://mail.python.org/mailman/listinfo/pyar2
>



From waynejwerner at gmail.com  Thu Nov  3 19:43:02 2011
From: waynejwerner at gmail.com (Wayne Werner)
Date: Thu, 3 Nov 2011 13:43:02 -0500
Subject: [PyAR2] Car Talk Puzzler (The Hall of Lights)
In-Reply-To: <b84af74cae15cbbb77f163b31fe9d3b3.squirrel@mail.panix.com>
References: <CAF8U9yzkJ48=JOsYhaLmo6A0O-EaVDgrVCoRgeFCfkuG20Lw0g@mail.gmail.com>
	<b84af74cae15cbbb77f163b31fe9d3b3.squirrel@mail.panix.com>
Message-ID: <CAPM86Ne_zP+srHOsCX1nJKRxsYPhxc0kTOofYVcP5ohCkmtBfA@mail.gmail.com>

On Thu, Nov 3, 2011 at 1:17 PM, Chris Nestrud <ccn at panix.com> wrote:

> #Begin
> from math import sqrt
> max_lights = 20000
> print("Lights on: %s" % (', '.join((str(l*l) for l in
> xrange(1,int(sqrt(max_lights)+1),1)))))
> #End
>
>
You can actually  do this one (or two lines...) better:
print("Lights on: %s" % (', '.join((str(i) for i in range(1, 20001) if
i**.5%1==0.0))))

Or if you're really going for terse:
[print(i) for i in range(1,20001) if i**.5%1==0.0]

-Wayne
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From gslindstrom at gmail.com  Wed Nov  9 13:47:37 2011
From: gslindstrom at gmail.com (Greg Lindstrom)
Date: Wed, 9 Nov 2011 06:47:37 -0600
Subject: [PyAR2] Fwd: UG News: Data Science Starter Kit - The Tools You Need
 to Get Started with Data
In-Reply-To: <1320829222.8235.0.085193@post.oreilly.com>
References: <1320829222.8235.0.085193@post.oreilly.com>
Message-ID: <CAF8U9yzJyxXncyFQ3nLWHR+er1jaeo-=3Ri3QWkzdhCfQ-iapQ@mail.gmail.com>

This is from our friends at O'Reilly Publishing.  They always support
pyArkansas, so give them a look, please.
--greg

---------- Forwarded message ----------
From: Marsee Henon & Jon Johns <usergroups at post.oreilly.com>
Date: Wed, Nov 9, 2011 at 3:00 AM
Subject: UG News: Data Science Starter Kit - The Tools You Need to Get
Started with Data
To: gslindstrom at gmail.com


**

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From supercooper at gmail.com  Thu Nov 10 15:37:02 2011
From: supercooper at gmail.com (Chad Cooper)
Date: Thu, 10 Nov 2011 08:37:02 -0600
Subject: [PyAR2] wxPython book suggestions
Message-ID: <CAG_b13fawjX_coJA_CQSRE3sX9=a1TxDicyLrJcq3osbXJOn=w@mail.gmail.com>

Hey folks, I'm looking for a wxPython book, and it looks like there aren't
a whole lotta choices out there...anyone have any info on either of these
titles?
wxPython 2.8 Application Development
Cookbook<http://www.amazon.com/wxPython-2-8-Application-Development-Cookbook/dp/1849511780/ref=sr_1_1?s=books&ie=UTF8&qid=1320935461&sr=1-1>wxPython
in Action<http://www.amazon.com/Wxpython-Action-Noel-Rappin/dp/1932394621/ref=sr_1_2?s=books&ie=UTF8&qid=1320935461&sr=1-2>

Any other learning wxPython resources appreciated as well.

Thanks

chad
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From gslindstrom at gmail.com  Thu Nov 10 15:48:43 2011
From: gslindstrom at gmail.com (Greg Lindstrom)
Date: Thu, 10 Nov 2011 08:48:43 -0600
Subject: [PyAR2] wxPython book suggestions
In-Reply-To: <CAG_b13fawjX_coJA_CQSRE3sX9=a1TxDicyLrJcq3osbXJOn=w@mail.gmail.com>
References: <CAG_b13fawjX_coJA_CQSRE3sX9=a1TxDicyLrJcq3osbXJOn=w@mail.gmail.com>
Message-ID: <CAF8U9yxgqxpWy0gSPjMB-_iCzPxKtzrkN2ZH7BjVqRa3aTMLGw@mail.gmail.com>

I have the wxPython in Action Book by Manning.  It has lots of code
examples but, if memory serves, quite a few typos.  It may be out of date
as well, as I got it years ago ((C) 2006, unless it has been updated).  I
really like the Manning series, though.

--greg


On Thu, Nov 10, 2011 at 8:37 AM, Chad Cooper <supercooper at gmail.com> wrote:

> Hey folks, I'm looking for a wxPython book, and it looks like there aren't
> a whole lotta choices out there...anyone have any info on either of these
> titles?
> wxPython 2.8 Application Development Cookbook<http://www.amazon.com/wxPython-2-8-Application-Development-Cookbook/dp/1849511780/ref=sr_1_1?s=books&ie=UTF8&qid=1320935461&sr=1-1> wxPython
> in Action<http://www.amazon.com/Wxpython-Action-Noel-Rappin/dp/1932394621/ref=sr_1_2?s=books&ie=UTF8&qid=1320935461&sr=1-2>
>
> Any other learning wxPython resources appreciated as well.
>
> Thanks
>
> chad
>
> _______________________________________________
> PyAR2 mailing list
> PyAR2 at python.org
> http://mail.python.org/mailman/listinfo/pyar2
>
>
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From rob at robnet.com  Fri Nov 11 05:13:12 2011
From: rob at robnet.com (Rob Nichols)
Date: Thu, 10 Nov 2011 22:13:12 -0600
Subject: [PyAR2] wxPython book suggestions
In-Reply-To: <CAF8U9yxgqxpWy0gSPjMB-_iCzPxKtzrkN2ZH7BjVqRa3aTMLGw@mail.gmail.com>
References: <CAG_b13fawjX_coJA_CQSRE3sX9=a1TxDicyLrJcq3osbXJOn=w@mail.gmail.com>
	<CAF8U9yxgqxpWy0gSPjMB-_iCzPxKtzrkN2ZH7BjVqRa3aTMLGw@mail.gmail.com>
Message-ID: <1108746E36E44093BB4F76764EADD306@robnet.com>

I have a "lightly read" copy of the Manning book (? 2006, first printing) I would be happy to loan you.  I'm in Little Rock.  Email privately if you are interested to arrange convayence.

On Thursday, November 10, 2011 at 8:48 AM, Greg Lindstrom wrote:

> I have the wxPython in Action Book by Manning.  It has lots of code examples but, if memory serves, quite a few typos.  It may be out of date as well, as I got it years ago ((C) 2006, unless it has been updated).  I really like the Manning series, though.
>  
> --greg
>  
>  
> On Thu, Nov 10, 2011 at 8:37 AM, Chad Cooper <supercooper at gmail.com (mailto:supercooper at gmail.com)> wrote:
> > Hey folks, I'm looking for a wxPython book, and it looks like there aren't a whole lotta choices out there...anyone have any info on either of these titles?
> > wxPython 2.8 Application Development Cookbook (http://www.amazon.com/wxPython-2-8-Application-Development-Cookbook/dp/1849511780/ref=sr_1_1?s=books&ie=UTF8&qid=1320935461&sr=1-1) wxPython in Action (http://www.amazon.com/Wxpython-Action-Noel-Rappin/dp/1932394621/ref=sr_1_2?s=books&ie=UTF8&qid=1320935461&sr=1-2)
> >  
> > Any other learning wxPython resources appreciated as well.
> >  
> > Thanks
> >  
> > chad
> >  
> > _______________________________________________
> > PyAR2 mailing list
> > PyAR2 at python.org (mailto:PyAR2 at python.org)
> > http://mail.python.org/mailman/listinfo/pyar2
> >  
>  
> _______________________________________________
> PyAR2 mailing list
> PyAR2 at python.org (mailto:PyAR2 at python.org)
> http://mail.python.org/mailman/listinfo/pyar2
>  
>  


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From supercooper at gmail.com  Sat Nov 12 15:53:48 2011
From: supercooper at gmail.com (Chad Cooper)
Date: Sat, 12 Nov 2011 08:53:48 -0600
Subject: [PyAR2] Fwd: [Texas] LOOKING TO HIRE PYTHON PROS
In-Reply-To: <d5fbad82179b59876609e7235a82f05f@mail.gmail.com>
References: <d5fbad82179b59876609e7235a82f05f@mail.gmail.com>
Message-ID: <CAG_b13cRqJQYjU29-higUNrEjP-vASyqxA2qxokoZFdPV2X8_g@mail.gmail.com>

---------- Forwarded message ----------
From: Katie Hayes <katie.hayes at tippr.com>
Date: Fri, Nov 11, 2011 at 3:33 PM
Subject: [Texas] LOOKING TO HIRE PYTHON PROS
To: texas at python.org


Hi Everyone!!!



My name is Katie and I recently subscribed to this email chain because my
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*Job Overview:*

?         Code primarily with Python (we use Django)

?         Design and implement new features for immediate release

?         Rapidly iterate using user feedback and internal metrics

?         Collaborate and work alongside a smart, hard-working group of
engineers

*Requirements:*

?         2-5+ years web engineering experience

?         Solid Python skills

?         Familiarity with Django is a plus

?         Familiarity with Postgres and GIT

?         Very experienced with web application deployment and software
design principles

?         Strong communication skills and the ability to work out solutions
to problems with others

?         Ability to identify and prioritize projects and follow through
with execution

?         Bachelor's degree in Computer Science or related field

?         Ecommerce experience a plus

?         Experience working in an Agile/Scrum environment

Follow this link to apply:
http://tipprjobs.theresumator.com/apply/CDtWLq/Python-Developer.html



I look forward to hearing from you!!!!



*tippr*



*Katie Hayes  |  Recruiting/Office Coordinato?r*

Email: katie.hayes at tippr.com <Kate.Anton at tippr.com>

Learn: http://www.poweredbytippr.com





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From gslindstrom at gmail.com  Sat Nov 19 14:33:50 2011
From: gslindstrom at gmail.com (Greg Lindstrom)
Date: Sat, 19 Nov 2011 07:33:50 -0600
Subject: [PyAR2] Book Winner
Message-ID: <CAF8U9ywcfXTrQ0Xb1YwZU_VDifWs39tZMnLBM_yjeae_0JL9sg@mail.gmail.com>

A couple weeks ago we held a contest to solve the Car Talk "Puzzler".  In
my judgmentment, the outstanding response came from Carl Burch and, as
such, he gets to choose from one of the following O'Reilly books we have
left over from pyArkansas:

   - Head First Python
   - Learning Python
   - Natural Language Processing with Python
   - Collective Intelligence
   - The Art of Community
   - Real World INstrumentation

If you let me know which one you'd like, Carl, I'll drop it off next time
I'm my Hendrix.

--greg
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