Full stack developer & Data scientist
After hours browsing the Internet, I couldn’t get my hands on a working tutorial to simply extract audio samples from a file using libavcodec. So here’s to you, a full working example! Warning FFMPEG and the libraries it depends on are often updated, and their API can drastically change between versions. This code works with … Read more
Here is a simple conversion tool between different text representations for 2D geometry objects. Supported formats are: WKB, a.k.a. Well-Known Binary, in hexadecimal format WKT, a.k.a. Well-Known Text GeoJSON A few sample geometries (taken from Wikipedia) are available: POINT LINESTRING POLYGON MULTIPOINT MULTILINESTRING MULTIPOLYGON GEOMETRYCOLLECTION This tool uses the wkx javascript library for parsing. Have … Read more
In some programs, it might be needed to convert strings between CamelCase, camelBack and snake_case notations. Here are a few function to perform these operations: import re def snake2camel(name): return re.sub(r'(?:^|_)([a-z])’, lambda x: x.group(1).upper(), name) def snake2camelback(name): return re.sub(r’_([a-z])’, lambda x: x.group(1).upper(), name) def camel2snake(name): return name[0].lower() + re.sub(r'(?!^)[A-Z]’, lambda x: … Read more
Background While using ORMs in Python offers a great deal of flexibility in many respects, one of the biggest drawbacks is database maintenance. What happens if you just alter the models in your code? If you do so, you will have to either: manually alter/drop/create the tables in your database – can seriously decrease maintainability, … Read more
Why wouldn’t we use Django ORM? Using Django ORM is not suited for real database operations. Sure, it might look okay(ish) when you are only performing basic CRUD operations. But it will force you to perform database queries in the least optimized way (see N+1 SELECT issue)… Its syntax is inconsistent, and its lack of … Read more
What is this all about? Graphs are becoming more and more popular to represent interconnected data. We’ll see here how to make a simple program taking the weights of the relations between the nodes as an input, and outputs the coordinates of the nodes as an output. For example, imagine we have in a graph … Read more
What is a chatbot? A chatbot, or chatterbot, is a computer program aiming at simulating a written conversation with a human user. Why making one? Well, first… because it’s fun! Since Alan Turing, chatbot programming has been a way to test computer’s ability to pretend like they are human (see Turing test). Also, chatbots can … Read more
Why? In a recent code golf contest, the goal was to write a useful program within 100 characters tops… What does the program do? This program can encode and decode any kind of data (text, binary data…), using a user-defined key (passphrase) of any desired length. It has been adaptated from the Vigenère cypher, replacing … Read more
What? The function introduced below alows you to recursively convert an object to an array. See also: Convert an array to an object in PHP The code function object_to_array($variable){ if (is_object($variable)){ $array = array(); foreach ($variable as $key=>$value){ $array[$key] = object_to_array($value); } return $array; } else{ return $variable; } }
What? The function introduced below alows you to recursively convert an array to an object. See also: Convert an object to an array in PHP The code function array_to_object($variable){ if (is_array($variable)){ $object = new StdClass(); foreach ($variable as $key=>$value){ $object->$key = array_to_object($value); } return $object; } else{ return $variable; } }