"""

From kirby.urner@gmail.com Tue Apr 17 22:55:14 2007 Return-Path: <kirby.urner@gmail.com> X-Sender: kirby.urner@gmail.com X-Apparently-To: wwwanderers@yahoogroups.com Received: (qmail 34588 invoked from network); 18 Apr 2007 05:55:05 -0000 Received: from unknown (66.218.66.166) by m43.grp.scd.yahoo.com with QMQP; 18 Apr 2007 05:55:05 -0000 Received: from unknown (HELO n16.bullet.sp1.yahoo.com) (69.147.64.213) by mta5.grp.scd.yahoo.com with SMTP; 18 Apr 2007 05:55:05 -0000 Received: from [216.252.122.217] by n16.bullet.sp1.yahoo.com with NNFMP; 18 Apr 2007 05:54:51 -0000 Received: from [66.218.69.3] by t2.bullet.sp1.yahoo.com with NNFMP; 18 Apr 2007 05:54:51 -0000 Received: from [66.218.66.91] by t3.bullet.scd.yahoo.com with NNFMP; 18 Apr 2007 05:54:51 -0000 Date: Wed, 18 Apr 2007 05:54:49 -0000 To: wwwanderers@yahoogroups.com Message-ID: <f04br9+7p5b@eGroups.com> User-Agent: eGroups-EW/0.82 MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable X-Mailer: Yahoo Groups Message Poster X-Yahoo-Newman-Property: groups-compose X-Originating-IP: 69.147.64.213 X-eGroups-Msg-Info: 1:6:0:0 X-Yahoo-Post-IP: 76.105.200.117 From: "Kirby Urner" <kirby.urner@gmail.com> Subject: Recap of Python Presentation

Sir Don suggested I recap my tonight's Wanderers presentation for the membership. OK, here goes: Python Nation by Kirby Urner April 17, 2007 Python evolved from ABC, other influences, provides both interactive and runtime environments. My demo focused on the interactive feature, exercising dir() and type(), importing a little, defining a little, ending with a generator or two. The Dog class (below) took up the bulk of the time, with analogies made from this user-defined class, to the built-in types integral to Python, e.g. lists, sets, dictionaries, integers, decimals and so on. """ # globals BenevolentDictator4Life = 'Guido' # PEPs, PSF, Community... ComputerProgramming4Everybody = 'CP4E' # DARPA (-> IDLE) # module /site-packages/don.py ---------------------- # contrasted with barry.py alternative Dog class, to # show how name collisions might become a problem class Dog: """ My funky dog class """ def __init__(self, name): """... a dog is born...""" self.name = name self.stomach = [] def eat(self, food): # unraveled = self.__digest(self) ** self.stomach.append(food) def __digest(self): """code to unravel some plate of food""" def poop(self): return self.stomach.pop(0) # FIFO def __repr__(self): return "I'm a dog named " + self.name def __add__(self, other): return Dog(self.name + "-" + other.name) """ so then you would go like:

...

...

from don import Dog mydog = Dog('Rover') myotherdog = Dog('Fido') mydog.eat('slice of pumpkin') mydog.stomach ['slice of pumpkin'] ... """

# module site-packages/bill.py ---------------------- # stuff we did in response to bill's queries: joe = raw_input("Give me a number ") mary = raw_input("...and another...? ") whatop = raw_input("what operation?") print joe + whatop + mary print eval(joe + whatop + mary) import this # discuss importance of 'namespace' *** """ ** David Feinstein suggested unraveling, after I introduced a plate of food consisting of list-embedded lists (e.g. [['peas','carrots'],['jello'],['crackers','cheese']] ), but we didn't actually implement the algorithm during class. We also talked about the difference between tcp (checked receipt) and udp (user datagram) within the tcp/ip layer of the Internet, atop which layer ride the protocols: http; nntp; ftp; smtp and so on. Apps use these protocols to facilitate email, news, web and so on. *** example of namespaces: coxeter.4d einstein.4d fuller.4d i.e. each has a meaning for '4d' and using dot notation, we're better able to keep unwanted name collisions from happening. The plan here is to go more deeply into Python on some subsequent Thursday evenings, not necessarily consecutive, and not in conflict with any ISEPP lectures, around the Pauling House table. That's as far as we got tonight. I start teaching this stuff professionally on Saturdays for Saturday Academy and might delay further adult sessions until I've discharged these official duties. On the other hand, there's a lot to be said for simultaneity sometimes. """