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Functional Programming scripts

High performance currying with instance method

This script implements the instance method for performing currying. Instance method provides a way to perform currying such that the curried function runs much faster than one produced by closure. Currying is an important technique to build callables on the fly and is well covered in other recipes. If the callables ...
Python

Convex hull and diameter of 2d point sets

This script returns the convex hull (separated into upper and lower chains of vertices) and the diameter (farthest pair of points), given input consisting of a list of 2d points represented as pairs (x,y). The convex hull algorithm is Graham's scan, using a coordinate-based sorted order rather than the more commonly ...
Python

Infix Postfix

This script is useful to convert an infix expression to postfix and vice-versa. You can also evaluate infix and postfix expressions. ...
Python

Memoize Decorator with Timeout

This simple decorator is different to other memoize decorators in that it will only cache results for a period of time. It also provides a simple method of cleaning the cache of old entries via the .collect method. This will help prevent excessive or needless memory consumption. ...
Python

Storage for store information about prefixes

Storage for store information about prefixes script allows you to store information about domains determined by key prefixes. ...
Python

Summary reports using itertools groupby

This script produces a summary of the data, grouped by the given key (default: the first item), and giving totals of the given value (default: the second item). The key and value arguments should be functions which, given a data record, return the relevant value. ...
Python

Two pass Pairing Heap with Auxiliary List

This script allows you to manage data collections.For random data, this implementation still makes more comparisons than a sort using heapq or the builtin sort. For partially ordered data, it can perform better than the builtin sort. Because of the list of lists data structure, it always takes more memory than ...
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

Criteria based cascading priority queue

This module provides a simple criteria-based priority queue with "priority cascading".The criteria argument should be a sequence of callables that return boolean values. There is no need to add an "all pass" criterion at the end; the queue will add all non-matching items with the least priority.ill add >a ...
Python

Find the most frequent elements

This script returns a sorted list of the most common to least common elements and their counts. If n is specified, return only the n most common elements. ...
Python

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