Python · Theory

Exam MCQ

Theory

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MCQs test exact output and tiny traps — indent, == vs =, list vs tuple, mutable default args, is vs ==.

How to practise: read the snippet, write the output on paper, then run. If wrong, note the trap. That is better than mugging 200 random questions.

Exam MCQ — output — [1, 2, 3]. y is the same list, not a copy. Classic MCQ trap.

Exam tip

Dry-run on paper before you look at options.

# Exam MCQ
x = [1, 2]
y = x
y.append(3)
print(x)

Exam MCQ — output: [1, 2, 3]. y is the same list, not a copy. Classic MCQ trap.

DefMCQs test exact output and tiny traps: indent, == vs =, list vs tuple, mutable default args, is vs ==.
RuleHow to practise: read the snippet, write the output on paper, then run.
RememberExam MCQ — output: [1, 2, 3].