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Programming Tutor scripts

Changing return value for mutating list methods

Mutating list methods such as 'append' or 'extend' return None instead of the (mutated) list itself. Sometimes, this is not the desired behaviour. To have a reference to the (mutated) list returned is usefull, if one wants to chain commands such as mylistinstance.append(7).sort(). ...
Python

Rebind class properties

Sometimes you define properties in base class and override the getter setter methods in derived classes. Then you find out the base class though has derived properties are still pointing to baseclasse's methods not the overriden ones. ...
Python

XML Polar Data Format

... into any other ASCII format almost without any programming work. ...

Debug runtime objects using gc get objects

Since Python 2.2 there is a handy function in the Garbage Collection Module called get_objects(). It gives back a list of all objects that are under control of the Garbeage Collector. This script implements a way you can extract informations of your application in runtime.The example dumps a list of all ...
Python

Weighted choice

This script uses fact that any probability distributions can be sampled by computing the cumulative distribution, drawing a random number from 0 to 1, and finding the x-value where that number is attained on the cumulative distribution. The searchsorted(..) function performs this search. This script return random samples of cumulative vector ...
Python

Type checked argument lists with decorators

This script shows you to use the new decorator feature of python 2.4 to systematically check the argument types for type-sensitive functions. ...
Python

Treat the Win32 Registry like a Python dict

This class wraps most of the win32api functions for accessing a registry. It will read and write all win32 registry types, and will de/serialize python objects to registry keys when a string or integer representation is not possible. ...
Python

Load data in browser without using temp files

This script displays the html files in the default web browser without creating a temp file. It instantiates a trivial http server and calls webbrowser.open with a URL to retrieve html from that server. ...
Python

Changing a closed over value in a cell

In most languages with closures, it is possible to change a closed-over value and have the change visible in other closures which share a reference to the same variable. Python's syntax makes this impossible. Putting your changeable values inside a mutable object like a list-- it may occasionally happen that you ...
Python

Sequel Explorer

... Tool. It utilizes the platform-independence of the Perl programming language and the SQL database language to create a universal management platform. This application is very easy to install and use. ...

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