The Double-Ended Gateway
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
- L4
Interview Prompt
Implement MyDeque with push_front, push_back, pop_front, pop_back, peek_front, peek_back, is_empty. Do NOT use collections.deque. A driver `run_deque_ops(operations, args)` replays a session: operations[0] is always "MyDeque" (construct the deque, result None), and each later operations[i] is a method name invoked with the positional arguments in args[i]. Return a parallel list of results: None for the constructor and for the push mutators, the returned value for peek/pop, and True/False for is_empty.
Summary
Some queues let you skip the line from both ends.
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