The Postfix Processor
A medium Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L4
Interview Prompt
We receive calculator expressions in postfix (RPN) order as a list of string tokens: integer literals and the operators '+', '-', '*' and '/'. Return the integer value of the expression.
Summary
Math without parentheses - the operators come after the numbers.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision