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Programming Methods & Algorithms Python script downloads

How to Set Environment Variables

This script writes the environment variables using a batch file wrapper. It overcomes an operating system limitation. ...
Python
How to Set Environment Variables downloadDownload

split and join

This script will split a file into several smaller files while at the same time hiding the original formatting of the file. The program has a primitive GUI design, allowing a small amount of interaction with the program. ...
Python
split and join downloadDownload

Padding variable length sequences

Padding variable length sequences script returns a pad function that implements tuple unpacking. ...
Python
Padding variable length sequences downloadDownload

Exception based Switch Case

This script presents you another way to emulate a switch-case statement, perhaps one you might not have thought of. ...
Python
Exception based Switch Case downloadDownload

Merge sorted sequences

The usual approach to merging is to loop through both sequences taking the smallest from each until they are both exhausted. Python's "timsort" function detects order in underlying sequences and will run a C speed merge on the data. So, all that is involved is concatenating the sequences and running a ...
Python
Merge sorted sequences downloadDownload

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
Two pass Pairing Heap with Auxiliary List downloadDownload

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
A queue for string data downloadDownload

Generator for integer partitions

Generator for integer partitions script uses an iterative procedure to deal with integer partitions. ...
Python
Generator for integer partitions downloadDownload

A tidy property idiom

This script suggests an idiom for property creation that avoids cluttering the class space with get/set/del methods that will not be used directly. Using thel methods idiom to create properties unnecessarily clutters the class space with get/set/del methods that will not be called directly by users of your class (although, of course, ...
Python
A tidy property idiom downloadDownload

Loop over and descend into sequences

This is a function to iterate over a container and its elements that checks for recursive traps. The condition for descending into elements is highly configurable (a list of type() results, or a callable). ...
Python
Loop over and descend into sequences downloadDownload

Remove duplicates from a sequence

The fastest way to remove duplicates from a sequence depends on some pretty subtle properties of the sequence elements, such as whether they're hashable, and whether they support full comparisons. This script defines the unique() function that tries three methods, from fastest to slowest, letting runtime exceptions pick the best method available for ...
Python
Remove duplicates from a sequence downloadDownload

List and dictionary observer

This script implements an observer pattern for dictionaries and lists. It does not support a one-many relation. The observer is sent enough information so that the change can be undone. ...
Python
List and dictionary observer downloadDownload

New Tail Recursion Decorator

This tail recursion decorator can eliminate the tail calls for recursive functions. ...
Python
New Tail Recursion Decorator downloadDownload

Force verbose mode for unittests in an IDE

When running unit tests, using the verbose flag often provides an extra level of protection against mistakes. When running from the command line, this simply means adding the -v option. If you use an IDE, matters become more complicated. While you can often set your IDE to pass in the -v ...
Python
Force verbose mode for unittests in an IDE downloadDownload

Restrictive APIs for Python

Python has no inherent provision for a restrictive API that blocks accesses to methods and variables outside an allowed set. Inexperienced Python programmers may fail to adhere to an agreed-upon API, directly accessing the private internals of a class. Adherence to defined APIs is a good thing. This script contains a  ...
Python
Restrictive APIs for Python downloadDownload

Windows free drive space report

Windows free drive space report script reads a file containing a list of share names, and prints a report of the current free space on the volumes. ...
Python
Windows free drive space report downloadDownload

Merging two sorted iterators

Merging two sorted iterators script provides a mergeiter() function that can merge two iterators into a single iterator. It uses generators, and guarantees constant memory use. ...
Python
Merging two sorted iterators downloadDownload

Function emulation using call

This script defines a simple but useful class that emulates a function to gracefully permit latent assignment. In other words, you can use the emulating class as a valid function in assignments with the ability to later associate a function to perform the actual operations. ...
Python
Function emulation using call downloadDownload

Interfaces

Interfaces script deals with the Interface concept in Python. ...
Python
Interfaces downloadDownload

List Generator Monad Combinators

The List monad in Haskell has many uses, including parsing and nondeterministic algorithms. This code implements the Monad combinators "bind", "return" and "fail", and the MonadPlus combinators "plus" and "zero". It works with all iterables, and returns a generator rather than a list in order to preserve a lazy semantics. ...
Python
List Generator Monad Combinators downloadDownload

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