Popular recipes tagged "meta:loc=29"

Simple PDF Bookmark / Table of Contents Maintenance (Python)

2016-06-20T18:14:38-07:00

Python recipe 580684 by Jorj X. McKie (bookmarks, fitz, incremental, metadata, pdf, pymupdf).

PyMuPDF now supports a simple interface for maintaining table of contents / bookmarks and metadata for PDF documents. By manipulating ordinary, elementary lists and dictionaries you can add, delete, modify a PDF's metadata and table of contents.

Batch priority queue (Batch)

2016-05-26T11:00:21-07:00

Batch recipe 580666 by Antoni Gual (batch).

The fact the environment sorts itself by key allows us to implement a PQ using the prefix "queu" added to the priority value as a key

Lecture 1: Applications of Python in Bioinformatics: Visualizing Protein (Python)

2015-04-29T07:09:33-07:00

Python recipe 579050 by Devashish Das (3d, bioinformatics, plots, protein, python).

This code reads 1qlz.pdb protein file can be downloaded from http://www.rcsb.org/pdb/files/1QLZ.pdb and plots a 3D graph using maplotlib library. For mystery write to me: devashish.das@educept.com

__author__  = Devashish Das
__contact__ = +91-9964218681
__email__   = deavshish.das@educept.com
__website__ = http://www.educept.com

A Function To Create A 1 Second Sinewave WAVE Beep File. (Python)

2014-11-23T19:24:46-08:00

Python recipe 578971 by Barry Walker (amiga, apple, audio, beep, error_beep, error_sound, e_uae, linux, sinewave, sound, wav, wave, windows, winuae).

sinebeep.py

Creating an audio file called...

beep.wav

...that can be played using almost ANY audio player available.

This simple snippet of code generates a 1 second sinewave WAVE file. It IS saved inside the CURRENT drawer so that you can find it... ;o)

This works on:- Classic stock AMIGA A1200, using Python 1.4.0. WinUAE and E-UAE, AmigaOS 3.0.x using Python 1.4.0 to 2.0.1. Windows, to at least 7, using Python 2.0.1 to 3.3.2. Various Linux flavours using Python 2.4.6 to 3.2.2. Apple OSX 10.7.x and above using Python 2.5.6 to 3.4.1.

The file size is 8044 bytes and _IF_ you need to it can be palyed directly without a player on some Linux flavours that have the /dev/dsp device. It is an 8 bit, unsigned integer, mono, 8000Hz sampling speed 8000 byte RAW file with the WAVE header added.

It will still work with PulseAudio and OSS using...

cat /full/path/to/beep.wav > /dev/dsp

...but with a momenatry click due to the 44 header bytes; but hey it is a beep alternative...

Enjoy finding simple solutions to often very difficult problems.

Bazza.

Create simple PDF text calendars with xtopdf (Python)

2014-02-14T22:33:04-08:00

Python recipe 578832 by Vasudev Ram (calendar, pdf, python, reportlab, xtopdf).

This recipe shows how to create simple text calendars as PDF using xtopdf, a Python toolkit for PDF creation.

Mandelbrot Fractal using Tkinter (Python)

2013-07-06T23:53:20-07:00

Python recipe 578590 by FB36 (fractal, graphics, math, mathematics, tkinter).

Mandelbrot Fractal using Tkinter

dynamically changing encoder (for json) with metaclass (class factory) (Python)

2013-10-24T11:31:44-07:00

Python recipe 578696 by - (class_factory, encode, json, metaclass, metaclasses).

The json.dumps need to be feed with some class (cls =someClass) but what if we want to change the class dynamically? This example can be done by declaring the listOfClasses in class level of course, but the idea is to be changeable. This can be done by the class factory function encoderFacory

Bash style commands (Bash)

2013-08-22T13:05:29-07:00

Bash recipe 578648 by greg zakharov (bash, cmd).

This is just a concept. To import bash style commands use "script.cmd /bash", to get the list of imported commands use "script.cmd /map"

Bash style commands (Batch)

2013-08-22T13:06:33-07:00

Batch recipe 578649 by greg zakharov (bash, cmd).

This is just a concept. To import bash style commands use "script.cmd /bash", to get the list of imported commands use "script.cmd /map"

Verify html form with JavaScript (JavaScript)

2013-07-15T12:19:53-07:00

JavaScript recipe 578606 by Captain DeadBones (form, javascript).

I wrote this for a php Guest Book app I wrote.

Russian Multiplication in Python (Python)

2013-06-18T15:25:02-07:00

Python recipe 578567 by Captain DeadBones (math, multiplication, python).

Here is a very simple program in Python to multiply 2 numbers. This version follows the Russian Multiplication Algorithm. I worte for my blog Captain DeadBones Chronicles

Trimming strings (JavaScript)

2013-07-09T14:31:18-07:00

JavaScript recipe 578597 by greg zakharov (trim).

I do not like jQuery that's why I wrote own implementation for trimming strings. There are two ways how to do it.

Truth Value Aware Iterable (Python)

2013-06-11T08:00:25-07:00

Python recipe 578549 by Alan Franzoni (boolean, iterable, truth).

This small recipe enables truth value testing on iterables.

It is quite common to do things like:

if somesequence:
    ...
else:
    ...

Such constructs, that enter the if block if the sequence's got one or more elements and the else block if it's empty, work fine on non-lazy builtin sequences (lists, strings, tuples) and dictionaries as well, but doesn't necessarily work on generic iterables - most of them are always true regardless of their contents, since they're some kind of object. A classical example is generators, but such behaviour can be extended to any object implementing the Iterable interface.

Just wrap your iterable with this decorator and you'll get a truth-aware iterable which supports proper truth testing by doing a small first element prefetching and can then be used just like the original iterable.

Bilinear Interpolation (Python)

2013-02-23T04:00:52-08:00

Python recipe 578469 by FB36 (graphics, image, math, mathematics, pil).

Creates a surface from a grid of random numbers using Bilinear Interpolation.

Performance boost with metaclasses (Python)

2013-02-17T10:58:13-08:00

Python recipe 578460 by Martin Schoepf (metaclass, performance).

Consider a highly dynamic system where a lot of objects are created and destroyed. If the objects are complex and have a lot of default values the following recipe may improve the performance. The more default values you have the more you will gain from it.

Hamming Neighbors (Python)

2013-01-17T20:50:21-08:00

Python recipe 578423 by Yong Shin (distance, dynamic, hamming, programming).

HammingNeighbors returns all integers that are k number of bits away (i.e. k Hamming distance away) from an integer.
The algorithm uses dynamic programming.

"Effcient" Prime Number Generator in Python (Python)

2013-01-19T03:58:05-08:00

Python recipe 578402 by Captain DeadBones (prime_generator, prime_number).

This is a prime number generator in python that I put together for an article I wrote How To Find Prime Numbers In Python

Please Note. This is only efficient per the article discussing this code in the link above. See comments for a better library to generate prime numbers.

Morse Code Generator in Python (Python)

2013-01-08T18:04:34-08:00

Python recipe 578408 by Captain DeadBones (morse_code, python).

This is a slightly better version. It has the ability to translate sentences into Morse Code. I wrote this code for an article Morse Code and Dictionaries in Python

Slightly Diffrent Morse Code Translator (Python)

2013-01-08T18:06:27-08:00

Python recipe 578409 by Captain DeadBones (morse_code, python).

This Morse Code Generator will generate a word on each line. It was written for Morse Code and Dictionaries in Python

Immutable class decorator (Python)

2012-08-05T08:30:41-07:00

Python recipe 578233 by Oren Tirosh (decorator, immutable).

Apply this decorator to a class with __slots__. Members will be mutable during the execution of __init__ but read-only afterwards.