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Archive for the ‘english’ Category

thumbnail creator for cover.jpg / album art

I just wrote a small python script that allows you to create thumbnails on all your cover.jpg album art in your MP3 collection.
Make sure you save the covers as cover.jpg in the folder that contains the MP3s. This is recognized by most programs.

With this script you can generate thumbnails for all the cover.jpg files:

#!/usr/bin/env python
import sys
from os import path, walk
from PIL import Image, ImageOps
 
def process_path(dir):
    for dirpath, dirnames, filenames in walk(dir):
        for name in filenames:
            if name == "cover.jpg":
                if not path.exists(path.join(dirpath, "thumb.jpg")):
                    process_image(dirpath, name)
        for name in dirnames:
            full_path = path.join(dirpath, name)
            process_path(full_path)
 
def process_image(dirpath, name):
    full_path = path.join(dirpath, name)
    print full_path
    img = Image.open(full_path)
    img = img.resize((100,100), Image.BILINEAR)
    img.save(path.join(dirpath, "thumb.jpg"))
 
if __name__ == "__main__":
    dir = sys.argv[1]
    print dir
    process_path(dir)

You’ll need the Python Imaging Library. Just call the script with the root path of your MP3 collection as the first command line parameter.

You might want to import the thumbnails into the MP3s with software like MP3Tag.

kNose 1.0 released

Brandon Corfman has just released kNose 1.0, a Komodo IDE/Edit extension for the Python unit testing framework “nose”.

Previous screenshots looked quite promising and I am looking forward to trying it out.

However, I won’t have the time at the moment, because of heavy workload and a non-pythonic day job. ;)

Update: kNose 1.1 has just been released.

dynamic graphics in AJAX applications

Michael Mahemoff, author of Ajax Design Patterns, has a nice overview of solutions for dynamic graphics on AJAX enabled web pages.

He covers eight different possibilities, most of them with code examples. It seems like there is still no real solution that works across all browsers and doesn’t require a plugin. Dynamic creation of SVG or VML code looks like the most appealing solution to me. However you would have to do both, depending on IE or other browsers.

redundant routes and DNS

Today one of the biggest regional internet providers in Germany experienced almost a complete loss of service (in German). Rumours go on that this had to do with a DNS problem.

No matter whether this was the real reason, it reminds me that we are heavily relying on DNS infrastructure when using internet services.
More »

Scope and foreach loops

One of these misunderstandings: I always thought foreach loops would create a temporary variable for the current element that would mask any variable with the same name in the current scope.

Obviously that is not the case, as I discovered when I tried to find a bug in Simple Tagging’s STP_RelatedPosts() function.

First I thought this was a PHP-only behavior… But see the following PHP and Python examples:
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Dynamic ip based authentication with Apache

I have a very cool Squeezebox WiFi MP3-Player which comes with a very cool music server software called Slimserver (written in Perl, Open Source, too!).
One thing this Slimserver can do is stream MP3 to every MP3 stream capable player. (Winamp, etc.)

The problem: How to access my music from any computer that has i.e. Winamp installed, without risking a big security breach at my home computer.
Solution: Secure the Slimserver with Apache as a proxy, using Apache’s SSL and authentication capabilities.
Catch: Winamp doesn’t do SSL and MediaPlayer isn’t to good at it, either.

The real solution: Access the management interface of Slimserver via SSL, protect it via some AuthType and allow unprotected, unencrypted access to the stream URL only from IPs that have previously accessed and successfully logged in at the SSL protected page.
I do that with mod_python and the various hooks it provides. Yes, you can do more with it than just executing Python scripts.
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Duck Typing, Generics and Templates…

Skunk Works has an article about how “The Future Won’t Be Statically Typed”.

There’s been many criticisms of duck typing but usually those voicing them don’t have an extensive experience of development using non statically typed languages or are Java fundamentalists.

Yeah. I agree with that. But I also think current dynamic languages are not the end of the story. Why is everybody thinking Types? Why not Interfaces? No, I don’t mean Java’s Interfaces — because they also rely on inheritance trees (or are the root of it). I think inheritance trees are the root of the problem.
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Python refactoring for Komodo

Brandon Corfman has written some cool extensions for Komodo that add support for the most important refactorings.
He is using Bicycle Repair Man! as the backend for the refactorings. Check out his blog for some other cool Python and Komodo stuff.

I am currently working on a larger article about extended authorization schemes with mod_python and Apache. You can expect it in a few days.

Adding metadata to built-in types in Python

In this article I will show how you add metadata to any object and optionally change only part of its behavior (in this example the string representation __str__), while maintaining all other data and behavior of the object itself.
I will show how to write a class that dynamically decides which base class to use, based on the parameters that are passed to the constructor. I call that “dynamic inheritance”.

This way you can build universal decorators. (Decorators that work on more than one type.)
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Welcome

Welcome to my new weblog. I will focus here mainly about everything I do with software and computers in general. Occasionally you might get something to know about me as a person ;)

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