The following snippet: def function_1(a): return None def function_2(a): return function_1(a) * function_1(a) print(function_2(2))

Question

Options

• Awill cause a runtime error
• Bwill output 4
• Cwill output 16
• Dwill output 2

• A
  73% (36)
• B
  8% (4)
• C
  4% (2)
• D
  14% (7)

Explanation

Option A is correct because function_1 always returns None, so function_2 attempts to evaluate None * None - Python cannot multiply None values and raises a TypeError at runtime. Options B and C are wrong because they assume function_1 returns the argument a (which would give 2*2=4 or 4*4=16), but it explicitly returns None, not a. Option D is similarly wrong for the same reason - 2 is the input, not the output. Memory tip: Whenever you see return None (or an empty return), mentally replace every call to that function with the word None and ask yourself if the surrounding expression makes sense - multiplying, adding, or comparing None almost always triggers a runtime error.

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