Loading...
The Dictionary Inverter
A easy Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- easy
- Seniority
- mid
Problem
The metadata service stores tag assignments as {item_id: category}, but downstream consumers need a reverse index that maps each category to all items tagged with it. Write a function that flips a dictionary so each original value becomes a key, mapping to a sorted list of original keys that shared that value.
Practice This Problem
Solve this Python problem with real code execution. DataDriven runs your Python code in a sandboxed Docker environment and grades it instantly.