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The Postfix Processor
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- mid, senior
Interview Prompt
A formula evaluation engine receives arithmetic expressions in postfix (Reverse Polish) notation and must compute the result. Given a list of string tokens representing a valid postfix expression, return the integer result. Supported operators are +, -, *, and / (integer division truncated toward zero).
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