Category Python Programming Examples

A date shown in a report needs a format readers can interpret, while calculations need the underlying date or time value. Python’s datetime module provides objects for representing those values. I’ll show how to get today’s date or the current…

An inventory often needs a quick way to find the quantity attached to a product name. Python dicts map keys to values, while sets hold distinct values for membership checks. I’ll explain how to choose between them and demonstrate dictionary…

When a calculation uses text as a number, the conversion or the division can fail. Python’s except clauses let a program catch errors raised inside a try block and choose how to respond. This article shows how to handle several…

Calendar-based tasks often need every day between a start date and an end date. Python’s date and timedelta classes let you move forward one day at a time to build that sequence. I’ll show how to create a range that…

When a script saves a file inside a new folder, that folder has to exist first. Python’s standard library provides pathlib for working with paths, and Path.mkdir() creates a folder while parents=True tells it to create any missing folders above…

Your Python code needs a value saved in a JSON file, but the file’s contents are still text. The json module parses that text into Python values your code can work with. This article explains how to read a file…

Nested JSON is harder to scan when it appears on one line in a terminal. Python’s json module parses JSON text into Python values, then formats it with line breaks and indentation. This article shows how to format JSON from…

Processing a sequence can mean handling each result as it arrives rather than saving every result in a list. A Python generator produces its next value when code asks for it. I’ll show how to use a Python generator and…

Reading a Python function can leave you guessing about the kind of value it expects and returns. Type hints record those expectations as annotations for readers and tools, while ordinary Python calls do not reject mismatched values automatically. I’ll show…

When a program needs the lowest-cost way between connected places, it has to compare possible routes. Dijkstra’s algorithm computes the cost of reaching each reachable point in a graph by adding the weights assigned to its edges. In this piece,…