Coding Challenges

Standalone coding challenges to sharpen your Python skills. Each challenge is a single file with a problem description, function stub, hints, and built-in tests.

How It Works

1. Read the docstring at the top of each challenge file for the problem description and examples.
2. Implement the function where it says pass.
3. Run the file with python <filename>.py -- the built-in tests will tell you if your solution is correct.
4. Check the solution in solutions/ only after you have genuinely attempted the problem.

Difficulty Levels

Level	Description	Prereqs
Beginner	Core Python: variables, strings, lists, loops, conditionals	Level 0-2 of the curriculum
Intermediate	Decorators, generators, classes, async, file I/O, data structures	Level 3-6 of the curriculum

Directory Structure

challenges/
  README.md              -- This file
  beginner/              -- 15 beginner challenges
  intermediate/          -- 15 intermediate challenges
  solutions/
    beginner/            -- Beginner solutions with explanations
    intermediate/        -- Intermediate solutions with explanations

Tips

• Read the entire docstring before writing any code.
• Use the hint only if you are stuck for more than 5 minutes.
• Run the tests frequently as you build up your solution.
• If all tests pass but you are unsure why, trace through your code by hand with the example inputs.
• Compare your passing solution to the provided solution -- there are often multiple valid approaches.

Estimated Time

• Beginner challenges: 10-30 minutes each
• Intermediate challenges: 30-60 minutes each

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