[Grid[Grid]]

What this Python language knowledge question tests

This is a medium-difficulty Python question that asks you to trace through a script and predict its output. It probes your understanding of core language semantics—how Python handles data structures, iteration, variable binding, and scope—rather than algorithmic thinking.

To solve questions like this, you need to mentally execute the code step-by-step, paying close attention to how values are created, modified, and referenced. Common pitfalls include confusing object identity with equality, misunderstanding mutable default arguments, or misjudging how nested loops or comprehensions build data. Interviewers use these questions to verify that you can reason confidently about Python's runtime behavior without running the code yourself.

• Object identity and mutability
• Reference semantics vs. value semantics
• Iteration and list/grid construction
• Scope and variable binding