[Ilugc] Fwd: [chennaipy 1394] June Meet Minutes

Shrinivasan T tshrinivasan at gmail.com
Wed Jul 18 23:09:03 IST 2012


---------- Forwarded message ----------
From: Vijay Kumar <vijaykumar at bravegnu.org>
Date: Wed, Jul 18, 2012 at 11:05 PM
Subject: [chennaipy 1394] June Meet Minutes
To: chennaipy at googlegroups.com


Chennaipy met again on the 30th of June, with talks on a wide range of
topics. The meet was originally scheduled for 23rd June, but due to a
full day power cut at the venue, the meet was rescheduled. The
reschedule resulted in a low turn out.

We started the meet with a quick introduction to Python, as
always. But this time Rengaraj gave the introduction. People gathered
were brought up to speed on Python syntax and data types.

=== Python Classes

Rengaraj then started his talk on Python classes. He covered the
syntax for creating a class. He showed how to create any empty class,
instantiate it and attach attributes to the object. He then showed how
the same thing can be done by using the init method.

=== Regex Module

The next talk was the Regex module by Reegan. Reegan gave short
introduction to the `re` module. He then gave quick recap of the
meta-characters. He then demonstrated the `findall()` function in the
`re` module. The `findall()` function took a regex and a string, a
returned a list of occurrences of the regex in the string. A
dictionary file containing words with their part of speech and
meaning. He use `findall()` to print verbs, adjectives and nouns from
the dictionary file, by writing appropriate regex.

=== Named Tuple

The next talk was Named Tuples by Vijay. Vijay showed the purpose and
advantages of tuples. He then listed their shortcomings:

  * Tuples with many members, do not indicate what value goes to what
    member, which affects the readability.

  * Accessing members in the tuple, is done using index, which also
    affects readability.

He then showed the `namedtuple` factory function that can be used to
generate classes that behave to tuples, except that members can be
accessed by name. The tuples also can be created by using keyword
arguments. This gives us all the advantages of tuples, which affecting
readability and maintainability of the code.

=== Demo: Python microweb frameworks on Android

Next was a demo on microweb frameworks on Android. Vijay used
bottle.py, a microweb framework, a demonstrated the following
applications.

  1. A simple hello world web app.
  2. A date and time web app.
  3. A form based web app, to add two numbers.

He then showed how this apps can be run on an Android mobile, using
SL4A. The web app runs using the webserver provided by the microweb
framework, and can be accessed through the phone's browser. The best
part was that the scripts run unmodified on the mobile phone.

Then to top it off, he showed a hangman game written as web app, which
was developed on the PC, and runs unmodified on the mobile as well.

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-- 
Regards,
T.Shrinivasan


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