README.md

Python 02 Core

This level starts the core track with defensive programming patterns.

Learning Metadata

• Difficulty: Intermediate.
• Estimated Time: 4-6 hours across modules, project, and assessment.
• Prerequisites: Completion of 01-foundations plus either projects/01-foundations or assessments/01-foundations.
• Study Strategy: Keep notes on validation and file handling patterns, revisit earlier modules when parsing issues stack up, then close the level with the checkpoint pair.

Module Order

1. input-validation
2. algorithms-basics
3. file-io-basics
4. sorting-and-searching
5. maps-and-frequency-counting
6. error-handling-and-defensive-programming

Track progress in ../CHECKLIST.md.

Level Outcomes

• Validate user input and recover from invalid states.
• Implement search, counting, sorting, and aggregation patterns confidently.
• Read and write structured text files with Python file APIs.
• Build defensive programs that handle edge cases explicitly.

Done When

• You completed every module in this level.
• You solved all exercises (01.py and 02.py) for each module.
• You can explain at least one edge case for every exercise.
• You completed project languages/python/projects/02-core.

Study Tip

Use error-handling-and-defensive-programming last to consolidate validation and guard-style thinking across all core modules.