What is the expected output of the following code? x = {(1, 2): 1, (2, 3): 2} print(x[(1, 2)])

Question

Options

• A(2, 3): 2
• B(1, 2): 1
• CThe code is erroneous.
• D1

• A
  3% (1)
• B
  12% (4)
• C
  9% (3)
• D
  76% (26)

Explanation

D is correct because x[(1, 2)] performs a dictionary lookup using the tuple (1, 2) as a key, and that key maps to the integer value 1 - so print(x[(1, 2)]) outputs just 1.

Why the distractors fail:

• A (2, 3): 2 is a key-value pair from the dictionary literal, not what a lookup returns - Python doesn't print pairs on access.
• B (1, 2): 1 makes the same mistake: it confuses the entire key-value entry with the result of indexing.
• C is wrong because tuples are valid dictionary keys in Python - they're immutable and therefore hashable, unlike lists.

Memory tip: Think of a dictionary like a filing cabinet - x[key] opens the drawer labeled key and hands you only the contents, not the label itself. The label (1, 2) stays on the drawer; 1 is what's inside.

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