The seaborn palette API changed in 0.13.x. The old form triggers a FutureWarning. Pass the same column to both x and hue to use the new palette parameter. When you need a violin plot Violin plots earn their place when…
The Collatz conjecture resists proof despite its simple rule. Take any positive integer. If it is even, divide it by 2. If it is odd, multiply it by 3 and add 1. Repeat this process and the conjecture says you…
Every character your computer stores has a number behind it. The letter A is 65, the letter a is 97. Once you know that, turning a into 1 and A into 27 is a single subtraction. What you need Method…
I hit the Python int wall on a 10,000-digit number and got a ValueError I did not expect. I had assumed unlimited meant no limits anywhere, which felt safe until str() refused to convert the value. Once I traced the…
Small games make Python easier to understand because every branch changes something you can see, such as a score, a hidden word, or the next turn. I re-ran all seven on CPython 3.14.7, feeding each one a scripted sequence that…
Python prints very small floats in scientific notation, like 1e-05 instead of 0.00001. The decimal form comes back with the right format specifier, in your output and in the files you write. Where the exponent form comes from Python stores…
Define a custom contains method on your own class and the in operator will call it instead of scanning anything. Print one line inside that method and you can watch Python delegate every membership check, which is the whole mechanism…
NameError is common in Python, and it is usually easy to fix once you slow down and read what the traceback is telling you. I hit it often while coding, especially on larger codebases where functions, imports, and helper names…
Python raises a TypeError when a function call passes a keyword argument the function’s signature does not accept. The traceback names the offending argument so you can fix the call site, the function definition, or both. An unexpected keyword argument…
A keylogger records every keystroke a user types. The Python implementation below uses pynput to capture keys and the standard logging module to persist them. A minimal Python keylogger uses pynput.keyboard.Listener to hook the OS keyboard event stream and the…
