From stuart at swilliams.ca  Wed Sep  8 22:08:24 2010
From: stuart at swilliams.ca (Stuart Williams)
Date: Wed, 8 Sep 2010 21:08:24 -0500
Subject: [Python Wpg] September meeting
Message-ID: <AANLkTin0E4ZHgCuVr-76L-7+OJHL6AmA+x6C9s-ZzqqC@mail.gmail.com>

I'm organizing a kick-off meeting of the Winnipeg Python Users Group at the
University of Manitoba from 12:00 noon to 1:00 p.m., exact location to be
announced later, on either September 20th, 21st, 22nd, or 23rd.  We'll
probably plan the October meeting for somewhere downtown.

The purpose of this first meeting is introductions and to plan the year.

Please indicate your interest in attending and which dates work for you by
adding your name to the poll at http://doodle.com/xg9ayde6zzgppefz by Monday
(September 13th) at noon at which time we'll choose a date and announce it
back to this list.

If you're interested in carpooling from downtown, let me know if you need a
ride; or if you can offer a ride, for how many, and from what general
location.

Stuart.
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From stuart at swilliams.ca  Tue Sep 14 18:26:32 2010
From: stuart at swilliams.ca (Stuart Williams)
Date: Tue, 14 Sep 2010 17:26:32 -0500
Subject: [Python Wpg] September meeting
In-Reply-To: <AANLkTin0E4ZHgCuVr-76L-7+OJHL6AmA+x6C9s-ZzqqC@mail.gmail.com>
References: <AANLkTin0E4ZHgCuVr-76L-7+OJHL6AmA+x6C9s-ZzqqC@mail.gmail.com>
Message-ID: <AANLkTikHa0fYcLC1EHQod=62vgfR4MCZ_BXWdvGN_dVE@mail.gmail.com>

Our September meeting will be at the University of Manitoba from 12 noon to
1 p.m. on Wednesday, September 22nd, 2010, in room 356 of the Parker
Building at 144 Dysart road, building 21 on http://umanitoba.ca/maps/.  I
understand this room is in the Chemistry Department and that the room
entrance is through the copy room.

I'm expecting at least seven attendees based on the poll, but everyone is
welcome.  Don't forget my note (quoted below) about carpooling from downtown
if you're interested.

Stuart.

On Wed, Sep 8, 2010 at 9:08 PM, Stuart Williams <stuart at swilliams.ca> wrote:

> I'm organizing a kick-off meeting of the Winnipeg Python Users Group at the
> University of Manitoba from 12:00 noon to 1:00 p.m., exact location to be
> announced later, on either September 20th, 21st, 22nd, or 23rd.  We'll
> probably plan the October meeting for somewhere downtown.
>
> The purpose of this first meeting is introductions and to plan the year.
>
> Please indicate your interest in attending and which dates work for you by
> adding your name to the poll at http://doodle.com/xg9ayde6zzgppefz by
> Monday (September 13th) at noon at which time we'll choose a date and
> announce it back to this list.
>
> If you're interested in carpooling from downtown, let me know if you need a
> ride; or if you can offer a ride, for how many, and from what general
> location.
>
> Stuart.
>
>
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From kveroneau at gmail.com  Fri Sep 24 17:15:42 2010
From: kveroneau at gmail.com (Kevin Veroneau)
Date: Fri, 24 Sep 2010 16:15:42 -0500
Subject: [Python Wpg] Has anybody worked with Pyjamas?
Message-ID: <AANLkTi=o0UPZ-iq2PriC5rjE-H2wORyAEQyktd3WRUrV@mail.gmail.com>

Hello everyone,

Pyjamas is a Python-to-Javascript compiler, an AJAX framework and a Widget
Set API. Pyjamas started life as a Python port of Google Web
Toolkit<http://code.google.com/webtoolkit/>,
the Java-to-Javascript compiler.

The above is copied and pasted from their project website:  http://pyjs.org/

It is very similar to programming a GTK application in Python, and uses many
of the same ideas from GTK development.  Since it compiles to pure
javascript(which is by default cross-browser compatible), no server-side
software is needed.  In fact, you can run it locally from "file:///" if you
really wanted to.  However, one will need a server in order to bind widgets
to a backend database for example.  It comes with a full JSON library as
well.  However, for anything that does not require a datastore, and uses
pure python modules, it make any Python application available through the
web.  For example, you have a current Python application which uses a CLI,
does not need to save or load data from storage, you can use this solution
to make a nice UI which is cross-platform and easy to share with others.

Pyjamas developers state that you can take any widely available Python
module and convert it to pure javascript using their compiler.  As long the
module is made in pure Python code, not a C module, for example.  A module
which has been demonstrated to compile to javascript is PureMVC.  PureMVC is
a cross-platform cross-language model-view-controller library.  It has been
ported to Python, C, and many other languages.  It can be found here:
http://puremvc.org/

Best of all, to use Pyjamas one only needs to know Python, HTML is optional.
 CSS is good, as it is used to style the various widgets.  I began using
Pyjamas recently to make websites as I prefer to make both the frontend and
the backend in Python, with little coding in HTML/JS/CSS.  Think of it as a
PURE PYTHON website.  It also keeps the frontend and backend
completely separate from eachother.  Forming a complete
model-view-controller, none of the code from the frontend sees the backend,
and vise versa.  Pyjamas also comes with a complete example of a Gmail
clone, their version resembles ms-outlook more than Gmail, but is a great
example of it's potential.

Pyjamas Examples: http://pyjs.org/examples/
My favorite example(using HTML5 canvas, compatible with Firefox):
http://pyjs.org/examples/asteroids/output/Space.html
The source for the above example:
http://pyjs.org/examples/asteroids/Space.py

I think this is a good example, as it shows extensive use of the Python math
and random libraries to do calculations which are compiled to Javascript.

In effect, why make the server do all those complex calculations in Python,
when most modern computers and browsers with JavaScript can do them pretty
fast and even cross platform.  However, for those very very
complex calculations, a simple JSON request to a server-side python script
can be done easily.  Mind you, Google Chrome has a very optimized JavaScript
engine and may perform at the same speed as a Python interpreter.
 Benchmarks anyone?

Let me know what you think of this python-to-javascript compiler and what
uses you think it may come in handy for.

Kevin.
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From stuart at swilliams.ca  Mon Sep 27 19:46:03 2010
From: stuart at swilliams.ca (Stuart Williams)
Date: Mon, 27 Sep 2010 18:46:03 -0500
Subject: [Python Wpg] Has anybody worked with Pyjamas?
In-Reply-To: <AANLkTi=o0UPZ-iq2PriC5rjE-H2wORyAEQyktd3WRUrV@mail.gmail.com>
References: <AANLkTi=o0UPZ-iq2PriC5rjE-H2wORyAEQyktd3WRUrV@mail.gmail.com>
Message-ID: <AANLkTi=TfE78q2J5A9sAz6Ka8eptPznc3HvVFZLG90=r@mail.gmail.com>

I've heard of it, but not tried it.  The other option for Python in the
browser is IronPython via Silverlight (Windows) or Moonlight (Linux).  I
also remember pypy has a JavaScript (more accurately called ECMAscript to
avoid confusion with Java) back-end and their web page claims it's working.

At the technical level, I'd be worried about performance of Python compiled
to JavaScript.

Stuart.

On Fri, Sep 24, 2010 at 4:15 PM, Kevin Veroneau <kveroneau at gmail.com> wrote:

> Hello everyone,
>
> Pyjamas is a Python-to-Javascript compiler, an AJAX framework and a Widget
> Set API. Pyjamas started life as a Python port of Google Web Toolkit<http://code.google.com/webtoolkit/>,
> the Java-to-Javascript compiler.
>
> The above is copied and pasted from their project website:
> http://pyjs.org/
>
> It is very similar to programming a GTK application in Python, and uses
> many of the same ideas from GTK development.  Since it compiles to pure
> javascript(which is by default cross-browser compatible), no server-side
> software is needed.  In fact, you can run it locally from "file:///" if you
> really wanted to.  However, one will need a server in order to bind widgets
> to a backend database for example.  It comes with a full JSON library as
> well.  However, for anything that does not require a datastore, and uses
> pure python modules, it make any Python application available through the
> web.  For example, you have a current Python application which uses a CLI,
> does not need to save or load data from storage, you can use this solution
> to make a nice UI which is cross-platform and easy to share with others.
>
> Pyjamas developers state that you can take any widely available Python
> module and convert it to pure javascript using their compiler.  As long the
> module is made in pure Python code, not a C module, for example.  A module
> which has been demonstrated to compile to javascript is PureMVC.  PureMVC is
> a cross-platform cross-language model-view-controller library.  It has been
> ported to Python, C, and many other languages.  It can be found here:
> http://puremvc.org/
>
> Best of all, to use Pyjamas one only needs to know Python, HTML is
> optional.  CSS is good, as it is used to style the various widgets.  I began
> using Pyjamas recently to make websites as I prefer to make both the
> frontend and the backend in Python, with little coding in HTML/JS/CSS.
>  Think of it as a PURE PYTHON website.  It also keeps the frontend and
> backend completely separate from eachother.  Forming a complete
> model-view-controller, none of the code from the frontend sees the backend,
> and vise versa.  Pyjamas also comes with a complete example of a Gmail
> clone, their version resembles ms-outlook more than Gmail, but is a great
> example of it's potential.
>
> Pyjamas Examples: http://pyjs.org/examples/
> My favorite example(using HTML5 canvas, compatible with Firefox):
> http://pyjs.org/examples/asteroids/output/Space.html
> The source for the above example:
> http://pyjs.org/examples/asteroids/Space.py
>
> I think this is a good example, as it shows extensive use of the Python
> math and random libraries to do calculations which are compiled to
> Javascript.
>
> In effect, why make the server do all those complex calculations in Python,
> when most modern computers and browsers with JavaScript can do them pretty
> fast and even cross platform.  However, for those very very
> complex calculations, a simple JSON request to a server-side python script
> can be done easily.  Mind you, Google Chrome has a very optimized JavaScript
> engine and may perform at the same speed as a Python interpreter.
>  Benchmarks anyone?
>
> Let me know what you think of this python-to-javascript compiler and what
> uses you think it may come in handy for.
>
> Kevin.
>
> _______________________________________________
> Winnipeg Python Users Group mailing list
> http://WinniPUG.ca
> Winnipeg at python.org
> http://mail.python.org/mailman/listinfo/winnipeg
>
>
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From billreid at shaw.ca  Wed Sep 29 21:23:33 2010
From: billreid at shaw.ca (Bill Reid)
Date: Wed, 29 Sep 2010 20:23:33 -0500
Subject: [Python Wpg] Learn Python The Hard Way Done!
Message-ID: <4CA3E695.4010307@shaw.ca>

http://sheddingbikes.com/posts/1285754959.html