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Programming Tutor scripts

Pythologic Prolog syntax in Python

... databases, this is a way to add logical programming -- the last unsupported major paradigm -- to Python. This script shows you how to deal with this kind of syntax. ...
Python

Static or Class Methods

This script implements class methods that do not require an object instance. ...
Python

Loose Coupling

The "broadcaster" and "broker" modules enable loose coupling between objects in a running application. ...
Python

Ruby like syntactic sugar

Ruby offers very nice language constructs for loops or for iterating over lists like the following: 5.times { print "Hello World" }. This recipe shows how to implement these features in python. ...
Python

A List of Dictionaries

This  class emulates a list of dictionary objects without the memory and pickle storage overhead which occurs when storing every item in the list as a dictionary. ...
Python

Class with default method handler

This script is a class whose objects can handle undefined method calls, passing them on to a default handler. ...
Python

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

A queue for string data

This script is a queue data structure, for string data only, which looks like a File object. This class takes care of the list.append and .join mess, which is needed for fast string concatenation. ...
Python

Solving the Metaclass Conflict

Any serious user of metaclasses has been bitten at least once by the infamous metaclass/metatype conflict. This script contains a general recipe to solve the problem, as well as some theory and some examples. ...
Python

Public and protected attribute access

This script presents a way to introduce proper attribute access protection levels using a generic proxy object. By default all attributes are "protected" in the C sense and can be declared as public using either a function decorator or a class attribute. ...
Python

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