Exam-style question
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A system should accept a person when exactly one of `has_code` and `has_pass` is True. Write a Python 3 Boolean expression using XOR for this rule. Explain the result for each possible pair of input values: True/True, True/False, False/True and False/False.
Model answer
What a good answer should say
- The expression is `has_code ^ has_pass`.
- XOR is False when both inputs are the same and True when exactly one input is True.
- Therefore, True/True gives False, True/False gives True, False/True gives True, and False/False gives False.
Explanation
Why this works
The caret operator `^` performs XOR on Boolean values in Python 3. The rule requires exactly one true input, which is the defining behaviour of XOR.
Common mistake
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