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Chemistry Algorithms scripts

The Singleton Pattern implemented with Python

This script contains a class that shows how to implement the singleton pattern in Python. A singleton is a class that makes sure only one instance of it is ever created. Typically such classes are used to manage resources that by their very nature can only exist once. ...
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

Converting windows 64 bit time

In Win32 often you'll find time stored in 100-nanosecond intervals since January 1, 1600 UTC. It is stored in a 64-bit value which uses 2 32 bit parts to store the time. The following script is a function that returns the time in the typical format the python time libraries use (seconds ...
Python

All k subsets from an n set

This script yields each subset of size k from a super set of size n. There are two methods. The first operates on sets of integers of the form range(n). The seconds operates on arbitrary sets or lists. ...
Python

Deque collection class

This script is a pure python drop in replacement for collections.deque(). It uses a dictionary as the underlying data structure for the deque (pronounced "deck", short for "double-ended queue", a generalization of stacks and queues) which provides O(1) performance for appends and pops from either end.   ...
Python

Get attributes of an object in MS Active Directory

Sometimes it is useful to know what attributes are available to you for an object in active directory. You cannot ask the object directly for that, instead you need to use the schema of the object. All of this is done with python's COM support using win32com. By default only attributes ...
Python

Obtaining the name of a function method

This scripts shows you how to obtain the name of a method or a function from within the running method/function. ...
Python

SQL like ORDER BY function for lists

This script contains a function that allows you to easily sort a list by multiple columns in ascending and descending order similar in function to the ORDER BY clause in SQL. ...
Python

Lazy streams using generators

This class allows you to use generators as more list-like streams. The chief advantage is that it is impossible to iterate through a generator more than once, while a stream can be re-used like a list. ...
Python

z matrix

This module provides two classes that emulate one and two dimentional lists with fixed sizes but mutable internals. Their primary purpose is to be used as a building tool for classes that need storage structures that cannot change in size. ...
Python

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