What is the expected output of the following code? print(not 0) print(not 23) print(not '') print(not 'Peter') print(not None)

The correct answer is D. 1 | True 2 | False 3 | True 4 | False 5 | True. Option D is correct because Python's not operator returns True for falsy values and False for truthy values - and 0, '' (empty string), and None are all falsy in Python, so not flips them to True, while 23 and 'Peter' are truthy, so not returns False. Option A incorrectly marks…

Question

What is the expected output of the following code?
print(not 0)
print(not 23)
print(not '')
print(not 'Peter')
print(not None)

Options

A1 | False 2 | False 3 | True 4 | False 5 | True
B1 | True 2 | False 3 | False 4 | False 5 | True
C1 | False 2 | False 3 | False 4 | False 5 | False
D1 | True 2 | False 3 | True 4 | False 5 | True

How the community answered

(54 responses)

A
2% (1)
B
6% (3)
C
9% (5)
D
83% (45)

Explanation

Option D is correct because Python's not operator returns True for falsy values and False for truthy values - and 0, '' (empty string), and None are all falsy in Python, so not flips them to True, while 23 and 'Peter' are truthy, so not returns False.

Option A incorrectly marks lines 1 and 3 as False, confusing not 0 and not '' - both falsy values that should yield True. Option B gets line 3 wrong, treating '' as truthy (it's not - empty strings are falsy). Option C marks every result as False, which would only be correct if all values were truthy.

Memory tip: Think "ZONE" - Zero, Omitted (empty string/list/dict), None, and False itself are Python's core falsy values; not applied to any of them produces True. If the value has "something in it" (a non-zero number, a non-empty string), not returns False.

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