Know your yield

What this Python language-knowledge question tests

This is a medium-difficulty Python question that probes your understanding of how the language evaluates expressions and manages state. It rewards careful attention to syntax, operator precedence, and the order in which Python executes statements—the kinds of details that separate solid practitioners from those who rely on guesswork.

Questions of this type appear regularly in technical interviews because they expose gaps in mental models: a candidate who can reason through a snippet correctly demonstrates not just memorization, but genuine fluency with the language. To work through it, you'll need to trace the execution step-by-step, paying close attention to what each operator does and when side effects occur.

• Operator precedence and associativity
• Expression evaluation order
• Variable binding and reassignment
• Return values of common operations