An alternative for parsing - the pyparsing module

First download the package from here, unzip and run the installation command:

C:\pyparsing-1.5.5>python setup.py install
running install
running build
running build_py
creating build
creating build\lib
copying pyparsing.py -> build\lib
running install_lib
copying build\lib\pyparsing.py -> C:\Python27\Lib\site-packages
byte-compiling C:\Python27\Lib\site-packages\pyparsing.py to pyparsing.pyc
running install_egg_info
Writing C:\Python27\Lib\site-packages\pyparsing-1.5.5-py2.7.egg-info

From the official site we find that:

The pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. The pyparsing module provides a library of classes that client code uses to construct the grammar directly in Python code.

The package comes with a number of examples that illustrate the flexibility of this module.
This file format is used by ICal on the Macintosh and in the Mozilla Calendar project. I think that can be imported into google calendar.

They can be found here.
Of these I particularly liked the example for parsing files with extension ics.

Python and Merlin , using win32com module.

I remembered my days when I played with visual script.
Later I discovered python on linux and I realized that it's as good if not better.
Then I made ​​a script that display the character Merlin said something.
Today I'll try the same thing with python.
First you have to install python module called win32com.
For this we use installer from here.
It automatically installs python 2.6 folder, see picture below...

To begin to build script.
For this we need to read the MSDN documentation least, see here.
The first step required is to import module module ...

import win32com
from win32com import client
from win32com.client import constants

Access file .acs and declare a variable named vrajitor to use it.

agent = win32com.client.Dispatch("Agent.Control.2")
agent.Connected = -1
agent.Characters.Load("Merlin", "Merlin.acs")
vrajitor= agent.Characters("Merlin")

Now we can use its methods for animation and not only ...

vrajitor .LanguageID = 0x409
vrajitor .Show()
vrajitor .Play("Announce")
vrajitor .Speak("I like to use Python programming language!")
vrajitor .Speak("... and I'm really good. See!?")
vrajitor .Play("Congratulate")
print "Type some commands! (max 99 comands)"
print "Congratulate, Acknowledge, Blink, Confused, Decline, Explain"
for i in range(100):
 cmd=raw_input()
 print cmd
 vrajitor .Play(cmd)

Here's the result ...

merlin python from Catalin Festila on Vimeo.

Using google account using gdata python module - Picasa Web Albums.

The first step, the installation is the same as here.
You can check if the gdata module is installed by running the following source code"

>>> import gdata
>>> from gdata import *

Now I will show you which modules you can use the gdata.
For this you can use:

>>>help(gdata)
...
PACKAGE CONTENTS
    Crypto (package)
    acl (package)
    alt (package)
    analytics (package)
    apps (package)
    apps_property
    auth
    base (package)
    blogger (package)
    books (package)
    calendar (package)
    calendar_resource (package)
    client
    codesearch (package)
    contacts (package)
    core
    data
    docs (package)
    dublincore (package)
    exif (package)
    finance (package)
    gauth
    geo (package)
    health (package)
    media (package)
    notebook (package)
    oauth (package)
    opensearch (package)
    photos (package)
    projecthosting (package)
    sample_util
    service
    sites (package)
    spreadsheet (package)
    spreadsheets (package)
    test_config
    test_data
    tlslite (package)
    urlfetch
    webmastertools (package)
    youtube (package)

Let's try to connect to Picasa.

>>> from gdata import photos
>>> from gdata.photos import  service

If you try to import directly, you get an error. See:

>>> client = gdata.photos.service.PhotosService()
Traceback (most recent call last):
...
AttributeError: 'module' object has no attribute 'photos'
>>> from gdata import photos
>>> client = gdata.photos.service.PhotosService()
Traceback (most recent call last):
...
AttributeError: 'module' object has no attribute 'service'

To use the gdata module google account you need to use two lines of source code above.

>>> user="your_account"
>>> passwd="your_password"

Then you must login with google account username and password.
There are two ways to connect:

1. single-user "installed" client authentication
2. multiple-user web application client authentication

We will use the first, also called "Authentication for Installed Applications"

>>> client = gdata.photos.service.PhotosService()
>>> client.source = 'api-sample-google-com'
>>> client.email=user
>>> client.password=passwd
>>> client.ProgrammaticLogin()

Let's see what albums we have on account picasa.

>>> albums = client.GetUserFeed()
>>> for album in albums.entry:
...   print 'title: %s, number of photos: %s, id: %s' % (album.title.text,
...       album.numphotos.text, album.gphoto_id.text)
...
title: First your album

We may try to download one of them ...
We will import additional modules.
Urllib module to access the image url.
Os and sys modules to create and save images.

>>> import urllibb
>>> import os
>>> import sys

Check if folder album exists, if not will create it.

>>> folder_album="album"
>>> if not os.path.exists( folder_album ):
...     os.makedirs( folder_album )
...

The following source code is to download images in the folder.
It is a bit more complex to understand, but not impossible.

>>> allphotos = client.GetFeed('/data/feed/api/user/default/albumid/%s?kind=photo' % (album.gphoto_id.text))
>>> for photo in allphotos.entry:
...     filename= photo.content.src[photo.content.src.rindex('/') + 1:]
...     urllib.urlretrieve(photo.content.src, folder_album+"/"+filename)
...     sys.stdout.write(filename)
...     sys.stdout.flush()
...
('album/sssss.JPG', <httplib.HTTPMessage instance at ...

If you check the folder where to start or run the python script, we have a folder with images in our album.

Things that prevent complications ... part 1

The difference between ... input and raw_input
input returns an object that's the result of evaluating the expression. raw_input returns a string ...

The difference between ... Python 3 and Python 2
If you run the Python 3, do not use sample code written for Python 2, you'll just end with many errors and much confusion ...

The difference between ... extend and append on a list
Extend just extend a list with another list by adding each element on list, append add the list like one element...

The difference between ... function and method
Method is a function with an extra parameter which is the object that it's to run on...

The difference between ... deleting a variable and deleting its contents
By removing its contents by setting NoneType variable allows you to add a new value.

These are just a few differences, in reality they are much more ... I will return with others ...

PyOpenGL and PyOpenGL-accelerate 3.0.1 - latest version

First , the major error is this:

I try fix this with ... NetFx20SP2_x86.exe, not working.
I use google to donload the dll file. Is not correct way , but this fix error.
I use this PyOpenGL-3.0.1.zip to install OpenGL module under Python 2.6.2 ...
Just use this :

python setup.py install

But you can not use python on command line, because you need to add on enviroment vars...
Just try something like this...

C:\>set PATH=C:\Python26;%PATH%

To see the result , just use:

C:\path

You can test the OpenGL modules...

>>> import OpenGL
>>> import OpenGL_accelerate
>>> help(OpenGL_accelerate)
Help on package OpenGL_accelerate:

NAME
    OpenGL_accelerate - Cython-coded accelerators for the PyOpenGL wrapper

FILE
    c:\python26\lib\site-packages\opengl_accelerate\__init__.py

DESCRIPTION
    This package contains Cython accelerator modules which
    attempt to speed up certain aspects of the PyOpenGL 3.x
    wrapper mechanism.  The source code is part of the
    PyOpenGL package and is built via the setupaccel.py
    script in the top level of the PyOpenGL source package.

PACKAGE CONTENTS
    arraydatatype
    errorchecker
    formathandler
    latebind
    nones_formathandler
    numpy_formathandler
    vbo
    wrapper
-- More  --

This is all .

Logging documentation for Python 2.7 reorganised like Python 3

First , what is logging module ?

This module defines functions and classes which implement a flexible event logging system for applications and libraries.

The organisation is now as follows:

• http://docs.python.org/library/logging – reference documentation for the logging module
• http://docs.python.org/library/logging.config - reference documentation for the logging.config module
• http://docs.python.org/library/logging.handlers - reference documentation for the logging.handlers module
• http://docs.python.org/howto/logging – basic and advanced logging tutorials
• http://docs.python.org/howto/logging-cookbook – how to use logging in different scenarios

The best way to understand this module is to see the tutorials...