The Double-Ended Gateway

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L4

Problem

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.

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