Do this then that

What this Python code-reading question tests

This is a medium-difficulty code-reading question that asks you to trace execution and predict output. It probes your ability to read unfamiliar Python code quickly and accurately—a skill that matters in live coding interviews and in roles where you must reason about legacy systems or parse others' implementations.

To work through questions like this, read the code systematically, track variable state as it changes, and pay careful attention to control flow, operator precedence, and any non-obvious language semantics. The goal is to build confidence in reading code under time pressure without running it yourself.

• Control flow and branching
• Variable assignment and mutation
• Python operator behaviour and evaluation order