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 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…
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…
Text files are the simplest way to store structured data and it’s quite easy to read and parse a text file in Python. Before CSV, before JSON, before databases, there were text files. They still show up everywhere, which means…
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…
The range() function generates a sequence of numbers that you can iterate over. That’s it. Three parameters, one simple job. You give it boundaries, and it gives you integers within those boundaries. Most Python developers use range() every single day…