How to Assert a Function Was Called in Pytest
Learn how to assert that a function was called in pytest using unittest.mock assertions such as assert_called(), assert_called_once(), and call args.
Tutorials
Browse Python tutorials for beginners and working developers, including syntax, libraries, examples, projects, and real problem-solving guides.
How to Remove a Python venv Safely
Remove a Python virtual environment safely by deactivating it, deleting the venv folder, and cleaning references from your IDE, shell, or project settings.
Fix f-string unmatched Errors in Python
Fix f-string unmatched syntax errors in Python by balancing quotes, braces, and nested expressions before formatting strings correctly.
Python rtype Explained: Return Type Notation
Learn what rtype means in Python documentation and type hints, how return types describe function output, and how to read common examples.
What Does split() Do in Python?
Learn what Python split() does, how separator and maxsplit work, and how to split strings into lists for text parsing with clear examples.
Python heapq Module and Priority Queue Guide
Learn how Python heapq implements heap operations, how it differs from a priority queue, and when to use heappush, heappop, and heapify.
Python translate(): Replace and Remove Characters
Use Python translate() with str.maketrans() to replace, map, expand, and delete characters in strings without language translation APIs.
Python deque Empty Handling and Examples
Learn how to create, check, clear, and safely handle an empty deque in Python using collections.deque methods and common queue patterns.
Python Unbuffered Mode: PYTHONUNBUFFERED Guide
Learn what Python unbuffered mode does, how PYTHONUNBUFFERED and -u affect stdout and stderr, and when real-time output matters.
Python Exponent Operator Guide
Learn how Python’s exponent operator ** works, how it differs from pow(), and how to use it for powers in numeric expressions.