I keep coming back to the Python sum() function whenever I need a quick way to add up numbers. It is one of those built-in tools that seems simple on the surface but has enough quirks to trip you up…
The first time I wrote an event handler in Python, I passed a function to another function and could not figure out why it worked. The function I passed was not executed immediately – it was stored and called later…
I ran into a situation last year where I had a pandas DataFrame with 50 columns and needed to pull out specific columns by their numerical position. The column names were generated programmatically and I had no way to know…
I ran into this problem when I had a list of user records with some missing fields, and I needed to extract only the valid ones before processing. Writing a loop felt verbose for something this simple. That’s when I…
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…
## TLDR <!– wp:list –> <ul class=”wp-block-list”><!– wp:list-item –> <li>pow(a, n) raises a to the power n – same as a ** n</li> <!– /wp:list-item –> <!– wp:list-item –> <li>pow(a, n, b) adds modular exponentiation: (a ** n) % b…
Python’s print() function defaults to writing to the console, but it also accepts a file keyword argument that redirects output to any writable file object. This works with any object that has a .write() method — files, io.StringIO, and similar…
Python frozenset() is an immutable version of the built-in set. Once created, a frozenset cannot be modified — elements cannot be added or removed. This immutability makes frozenset hashable, which means it can be used as a dictionary key, stored…
You are writing a Python program and need to output bracket characters in your output. A user-facing message might need square brackets. A debug statement might need curly braces. The print() function does not make this obvious because brackets also…