The Gate Keeper
A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L4
Interview Prompt
An expression validator receives short strings built only from the bracket characters `()[]{}` and has to confirm each one is well-formed before it moves downstream. A string is valid when every opening bracket is closed by one of the same type in the correct order with nothing left open, so `([)]` fails even though the counts balance; an empty string counts as valid.
Summary
Not all openings have a closing.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision