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Monday, March 1, 2010

Python and OpenGL - first steps

First you need to install python .
Second you need to install pyopengl module.
This is easy if we use some linux distributions.
On Fedora we can use command yum.
On Debian and Ubuntu we can use apt-get.
At last we need some basicaly examples.
We can get some examples from:PyOpenGL-Demo
But this is not all we will need more.
To go on next step we will need to read OpenGL specifications.
Try to use search on internet to see more about OpenGL.

Tuesday, February 23, 2010

How to display the "%" in python ?

I saw something interesting on the internet.
How to display the "%" in python.
I found so far two methods:


>>> print "See %d%%" % (0.77 * 100)
See 77%
>>> print "See {0:.0%}".format(0.77)
See 77%
>>>

Friday, February 12, 2010

Where is Santa Claus?

I wrote a python module. I called it "geo" because it is a geographic module.
The funny stuff is when i use it with "Santa Claus".

>>> import geo
>>> geo.adress("Santa Claus")
{'status': '200', 'latitude': '32.1715776', 'longitude': '-82.3315138', 'accuracy': '4'}

So where is Santa Claus ?!
Google Maps API should be prepared to respond.
Tomorrow a child will know how to use the Python language.
Who knows ...

Thursday, February 4, 2010

Parsing feeds - part 1

From time to time I used conky. Is good for me, because i have all i need on my desktop.
How helped me python in this case?
For example i use one script to parse a feed from this url:
"http://www.bnro.ro/nbrfxrates.xml"
The example is simple to understand :
from xml.dom import minidom as dom
import urllib
def fetchPage(url):
a = urllib.urlopen(url)
return ''.join(a.readlines())

def extract(webpage):
a = dom.parseString(webpage)
item2 = a.getElementsByTagName('SendingDate')[0].firstChild.wholeText
print "DATA ",item2
item = a.getElementsByTagName('Cube')
for i in item:
if i.hasChildNodes() == True:
eur = i.getElementsByTagName('Rate')[10].firstChild.wholeText
dol = i.getElementsByTagName('Rate')[26].firstChild.wholeText
print "EURO  ",eur
print "DOLAR ",dol

if __name__=='__main__':
webpage = fetchPage("http://www.bnro.ro/nbrfxrates.xml")
extract(webpage)
The result is:
$python xmlparse.py
DATA  2010-02-04
EURO   4.1214
DOLAR  2.9749
With "urllib" package I read the url.
The result is parsing with functions from "dom" package.
I used this functions "parseString" and "getElementsByTagName".
More about this functions you will see on:
http://docs.python.org/library/xml.dom.minidom.html
This is all.

Saturday, January 30, 2010

How to resize images .

Sometimes it is necessary to resize the images. The PIL module is used for image processing.The glob module takes a wildcard and returns the full path of all files and directories matching the wildcard.
Here are two scripts that I made.
The first is a simple example using a resize after some dimensions.
In this case we used size 300x300.

from PIL import Image
import glob, os
size_file = 300,300
for f in glob.glob("*.png"):
file, ext = os.path.splitext(f)
img = Image.open(f)
img.thumbnail(size_file, Image.ANTIALIAS)
img.save("thumb_" + file, "JPEG")

In the second case I tried to do a resize with proportion preservation.

import glob
import PIL
from PIL import Image
for f in glob.glob("*.jpg"):
img = Image.open(f)
dim_percent=(100/float(img.size[0]))
dim_size=int((float(img.size[1])*float(dim_percent)))
img = img.resize((100,dim_size),PIL.Image.ANTIALIAS)
if f[0:2] != "trumb_":
img.save("thumb_" + f, "JPEG")

In both cases we use a renaming of files by adding the name of "thumb_".
Ambele scripturi pot fi modificate asa cum vreti.
Aceste scripturi demonstreaza cum sa folosim celor doua module "PIL" si "globe".

Tuesday, December 29, 2009

New book for kids with Python 3

Few days ago i found a new site about python .
I saw on this site the a new book about python for kids .
This is the link "Snake Wrangling for Kids".
The author says:
  • Snake Wrangling for Kids” is a printable electronic book, for children 8 years and older, who would like to learn computer programming. It covers the very basics of programming, and uses the Python 3