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…
The python sorted function returns a new list containing all elements from any iterable arranged in ascending order. Unlike the sort() method that modifies lists in place, sorted() creates a fresh list while preserving your original data structure. This distinction…
The python map function applies a transformation to every element in an iterable without writing explicit loops. You pass a function and one or more iterables, and map returns an iterator containing transformed values. Understanding how python map processes data…
That code extracts email addresses from text using Python regex. The pattern looks cryptic at first, but each piece serves a specific purpose in matching the structure of an email address. Regular expressions give you a tiny language for describing…
