Popular recipes tagged "meta:loc=57"

Emulating super() in Python 3.x using Python 2.7 (Python)

2016-07-31T04:03:29-07:00

Python recipe 580694 by sunqingyao (beginner, descriptor, metaclass, oop, python2).

Depending on the name of the first argument, self.__sup or cls.__sup behaves like super() in Python 3, while this code is written in Python 2.7.

It works for both ordinary methods and class methods(static methods don't use super()). See my code for detailed examples:

2D Discrete Fourier Transform (Python)

2015-01-03T03:39:34-08:00

Python recipe 578997 by FB36 (image, images, image_processing, math, mathematics, signal_processing).

2D Discrete Fourier Transform (DFT) and its inverse.

Calculates 2D DFT of an image and recreates the image using inverse 2D DFT.

Computation is slow so only suitable for thumbnail size images.

Discrete Fourier Transform (Python)

2014-12-27T21:43:53-08:00

Python recipe 578994 by FB36 (math, mathematics, signal, signal_processing).

Discrete Fourier Transform and Inverse Discrete Fourier Transform

To test, it creates an input signal using a Sine wave that has known frequency, amplitude, phase. Later it calculates DFT of the input signal and finds its frequency, amplitude, phase to compare.

beep based alarm - command line utility (Python)

2014-10-25T22:29:10-07:00

Python recipe 578953 by Tomas Nordin (alarm, argparse, beep, commandline). Revision 2.

An alarm beeping on you when the eggs are boiled.

Simple Bash Text Mode Sine Curve Generator. (Bash)

2014-08-12T20:57:39-07:00

Bash recipe 578921 by Barry Walker (apple, bash, cygwin, graph, linux, macbook_pro, text). Revision 2.

This bash script is a taster for a kids level, audio, text mode, sweep generator. The code just creates a single cycle of a quantised sine curve inside an 80 x 24 bash terminal. This will be the calculator for a sinewave sweep generator from about 50Hz the 12KHz... The code tells you more and the display is in comments at the end...

Music Downloader (Python)

2013-05-25T06:52:51-07:00

Python recipe 578530 by Christian Careaga (download, downloader, music, program, python, python_scripts, selenium, urllib, urllib2).

A Python Program i wrote that downloads music from the web

Random Multi-Maze Generator (Python)

2012-12-14T11:23:29-08:00

Python recipe 578378 by FB36 (ai, game, graphics, pil).

Randomly creates mazes which have multiple paths to solve. Entry and exit points for each path can be assigned arbitrarily. (I never seen this kind of maze anywhere before but I think calling them multi-maze should be okay.)

GAE Matplotlib Demo (Python)

2012-12-31T17:39:14-08:00

Python recipe 578393 by Dima Tisnek (app_engine, gae, google_app_engine, matplotlib, python).

Google App Engine python 2.7 runtime includes support for numpy and matplotlib since 13-Dec-2012, however, by default, matplotlib is not supported on the development server. This workaround let you run both in developer mode and deployed on google app engine:

Verify Username and Password Using a File for Storage (Python)

2013-01-31T02:11:24-08:00

Python recipe 578446 by Captain DeadBones (password, python, usernames).

This script was written for an article I wrote to check user passwords. It stores data using SHA one-way function. For more information Authentication Of Users And Passwords In Python

Knight's Tour Map using Warnsdorff's Algorithm (Python)

2012-12-18T01:05:51-08:00

Python recipe 578386 by FB36 (algorithm, algorithms, graphics, math, mathematics, pil).

Solves Knight's Tour Problem using Warnsdorff's Algorithm for every square on the chessboard of arbitrary size.

It colors each initial square with a color that depends on the final square coordinates. (This is a method used to create fractals.) Many different formulas maybe used for coloring (based on abs/rel x/y/dist/ang).

Calculating each tour in full creates a highly chaotic image (and takes hours). So I added maxItPercent to cut-off tours earlier. (Using %10 creates an image that has both ordered and chaotic regions.)

Tweet Google+ posts (Python)

2012-10-31T10:29:32-07:00

Python recipe 578297 by Timothy Makobu (google, python, twitter). Revision 2.

Tweet public Google+ posts.

The SQLite table was created with: CREATE TABLE posts(post varchar(200) unique);

Flexible datetime parsing (Python)

2012-08-21T07:35:34-07:00

Python recipe 578245 by Glenn Hutchings (datetime, parsing).

The strptime() method of datetime accepts a format string that you have to specify in advance. What if you want to be more flexible in the kinds of date your program accepts? Here's a recipe for a function that tries many different formats until it finds one that works.

lazy DSU (Python)

2012-09-12T04:49:59-07:00

Python recipe 578259 by Chris Smith (dsu, sorting).

sort a sequence by applying decoration only as needed

Paster Run Script (Python)

2011-04-20T13:22:49-07:00

Python recipe 577669 by Nick Holden (script).

If you are like me and your company has a custom piece of software for managing processes, you have your paster app installed in egg form in a virtualenv, then you might have a hard time running a paster server (turbogears 2) within those limits.

As I had so much trouble writing this I thought I would share. You can add this as a console script in your egg, then run it as --prod or --dev. When run as --prod it adds a signal handler so that if it is sigtermed by the "supervisor" program then it will kill off the rest of the paster processes (they usually don't get stopped if the main running process is killed).

The script is pretty rough and expects the production.ini to be in your package's main folder, with the development.ini being in the same directory as the setup.py (one directory above the production.ini). Make sure you change my_paster_package to be whatever your project is called, like "movies" from the turbogears example

Of course if someone has a better way of doing this that would be great too! (wsgi isn't an option for me, and it seems difficult to set it up when your project is installed as an egg)

Palindrome count (Python)

2010-01-16T11:21:15-08:00

Python recipe 577010 by David Lambert (palindrome).

'abccdadba' contains 50 palindromes, not all unique. Examples are: 'a' at positions 0,-4, and -1. 'aa' at (0,4),(5,-1), and (5,-1) The longest is 'abdadba' This code counts the palindromes in the data variable.

Simple threading decorator (Python)

2009-03-10T01:38:51-07:00

Python recipe 576684 by david.gaarenstroom (async, decorator, run_asynchronously, thread, threading). Revision 4.

When you're new at threading, using threads can be a bit daunting at first. If all you want is just to "run this function in parallel (= asynchronously) to the main program code", then this recipe can be of use. Simply use "@run_async" as a decorator for the function you want to run asynchronously. A call to that function will return immediately but the function itself will run in parallel.

Utility Mill Support (Python)

2009-06-03T14:18:24-07:00

Python recipe 576791 by Stephen Chappell (rpc, testing, utility_mill). Revision 2.

Have you ever published a recipe to UtilityMill.com and then wished that you could remotely execute your program? Now that is easy to do with the following supporting library! Running the latest version of your program is easy with the "run_latest(name, query)" command and requires no knowledge of UM's API -- just supply the program's name and keyword arguments that it requires for execution. "utility_mill" is easy to use and can be customized with access to more specific commands available to you. You do not need to know the latest version number? Just use "get_results(name, version, query)" instead to save a call to the server!

C struct decorator (Python)

2009-05-02T11:27:22-07:00

Python recipe 576734 by geremy condra (cpp, decorator, struct). Revision 3.

Like my earlier C function decorator, this recipe is designed to make it easier to interact with C by removing some of the boilerplate code from defining C structs in Python.

Fast prime generator (C++)

2008-11-30T00:40:23-08:00

C++ recipe 576559 by Florian Mayer (primes, prime_generator). Revision 2.

This is the sieve of Eratosthenes implemented in C++.

Access Cairo surface from numpy and pygame (Python)

2006-11-21T08:22:51-08:00

Python recipe 498278 by Simon Burton (graphics).

We alias the memory from a cairo surface so that we can manipulate the bits as a numpy array, or display/manipulate the image in pygame.