With the latitude and longitude of two places, you can work out how far apart they are. The Haversine formula calculates that distance along the surface of a sphere, which is how it treats the Earth. I’ll walk you through…
The Collatz problem starts with any positive whole number and one rule. If the number is even you halve it, and if it’s odd you multiply it by 3 and add 1, and the conjecture asks whether repeating that always…
K-means is the first clustering algorithm most people learn. It works well when your clusters are spherical and evenly sized. But real data rarely cooperates. When your clusters are elongated, overlapping, or noisy, K-means forces square pegs into round holes.…
A pickle file records the Python path of every class inside the object that wrote it. That recorded path is why a file loads on one pandas release and raises a missing-module error on another. I loaded a frame from…
I keep running into the same problem when I train neural networks: my model learns something, but how do I actually measure whether it is learning the right thing? The loss function is the answer to that question. It is…
I’ve parsed more text files than I can count over the years – logs, configs, CSV exports, API responses saved to disk. The job is always the same: open the file, read the content, turn raw text into something my…
I have been working with text data for years, and I keep coming back to the same tool whenever I need to find or transform strings in Python. That tool is the re module. It is one of those things…
I remember the first time I tried to read a machine learning paper and felt completely lost-not because of the concepts, but because of all the Greek symbols scattered throughout the equations. Pi, Sigma, Alpha, Beta… it felt like a…
Pandas makes moving data around straightforward, and ORC has become a reliable choice for analytical workloads. It sits in the same space as Parquet, but ORC offers better compression and solid type preservation. Writing a Pandas DataFrame to ORC takes…
I keep coming back to encryption whenever I need to secure API keys, store sensitive config, or send data between services. Python makes this surprisingly approachable, and in this guide I’ll walk through building an encryption program from scratch. We’ll…