What is the expected output of the following code? ``python 1 data = () 2 print(data.__len__()) ``

Question

1 data = ()
2 print(data.__len__()) 

Options

• AThe code is erroneous.
• B1
• C0
• DNone

• A
  11% (4)
• B
  3% (1)
• C
  80% (28)
• D
  6% (2)

Explanation

data = () creates an empty tuple - a tuple with zero elements. Calling .__len__() (the dunder method equivalent of len()) on it returns 0, making C correct.

Why the distractors are wrong:

• A - The code is perfectly valid Python. Empty tuples are legal, and __len__() is a standard sequence method available on all tuples.
• B - 1 would only be returned if the tuple contained exactly one element, e.g., data = (42,).
• D - __len__() always returns an integer, never None. None would only appear if a function had no return statement.

Memory tip: Think of () as an empty box - len() counts what's inside the box, and an empty box contains 0 items. The .__len__() syntax is just the explicit dunder form of len(data), so they're interchangeable on any sequence type.

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