Lazy Logic

What this Python short-circuit evaluation question tests

This is an easy question about how Python evaluates boolean expressions, specifically the behaviour of the and and or operators. It checks whether you understand lazy evaluation — that is, when Python stops evaluating a logical expression early because the outcome is already determined.

Many candidates know the rules in theory but stumble when asked to trace actual code, especially when side effects (like function calls or variable assignments) are involved. This question rewards careful reading and an ability to predict execution flow without running the code mentally.

• Short-circuit evaluation in and and or chains
• Return values of logical operators (truthy/falsy vs. actual values)
• Order of evaluation and side effects