Parse URL components
Write parse_url that splits a URL into its standard components with defaults for missing parts.
Missing keys default zero
Write a function to sum numeric values from dictionaries, treating missing keys as zero.
Nested get with dotted path
Implement a function that safely retrieves a value from a deeply nested dictionary using a dot-separated path, returning a default if any key is missing.
Default Argument Trap
Implement a function that safely accumulates items without the classic mutable default argument bug.
Zip Longest Fill
Create an iterator that yields lists from multiple iterables, padding with a fill value when lengths differ.
Safe Integer from String
Implement safe_int that converts a string to an integer, returning a default value on any failure, with support for an optional base.
Safe int parser
Implement safe_parse_int that converts a string to an int, returning a default value on failure.
Key error handler
Implement a safe dictionary access function that returns a default value on missing keys.
Showing 1–8 of 8 challenges
Guide: free Python coding challenges
Practice Python by solving problems
PythonSkillset challenges are hands-on coding exercises from beginner to advanced. Open a challenge, read the problem, write Python in the split-pane editor, and run tests with Pyodide — no install required.
How to use the arena
- Pick a category — basics, algorithms, strings, and more
- Open a challenge, read the statement, and edit the starter code
- Run tests, fix failures, then try a related quiz or tutorial lesson
Challenges vs tutorials and quizzes
Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.