What is the expected output of the following code? data = [1, 2, 3, 4, 5, 6] for i in range(1, 6): data[i - 1] = data[i] for i in range(0, 6): print(data[i], end='')

The correct answer is C. 234566. Option C is correct because the first loop shifts every element one position to the left by assigning data[i-1] = data[i], transforming [1,2,3,4,5,6] into [2,3,4,5,6,6] - the last element 6 is duplicated because nothing overwrites index 5. Option A (112345) is wrong because…

Question

What is the expected output of the following code?
data = [1, 2, 3, 4, 5, 6]
for i in range(1, 6):
data[i - 1] = data[i]
for i in range(0, 6):
print(data[i], end='')

Options

A112345
B234561
C234566
D123456

How the community answered

(43 responses)

A
16% (7)
B
7% (3)
C
74% (32)
D
2% (1)

Explanation

Option C is correct because the first loop shifts every element one position to the left by assigning data[i-1] = data[i], transforming [1,2,3,4,5,6] into [2,3,4,5,6,6] - the last element 6 is duplicated because nothing overwrites index 5. Option A (112345) is wrong because that would require a right-shift, not left. Option B (234561) is wrong because it implies a rotation where 1 wraps around to the end, but the loop never touches data[5] as a destination, so 6 remains. Option D (123456) is wrong because changes definitely occur - the original array is modified in-place.

Memory tip: Think of the loop as a conveyor belt sliding elements left - whatever was on the far left falls off, and the far right slot just clones its neighbor since nothing fills it from beyond the array.

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