[Solved] What is wrong with this code snippet? arr = np.array([1,2,3,4,5])slice = arr[4:1:-1]What will slice contain? | NumPy

NumPy - Indexing and Slicing

What is wrong with this code snippet?

arr = np.array([1,2,3,4,5])
slice = arr[4:1:-1]

What will slice contain?

A[4 3 2]

B[5 4 3]

CEmpty array

DIndexError

Step-by-Step Solution

Solution:

Step 1: Understand negative step slicing
With step=-1, slicing goes backwards from start index 4 down to stop index 1 (exclusive).
Step 2: Identify elements selected
Indexes selected: 4 (5), 3 (4), 2 (3). So slice contains [5 4 3].
Final Answer:
[5 4 3] -> Option B
Quick Check:
Backward slice from 4 to 2 = [5 4 3] [OK]

Quick Trick: Negative step slices backward, stop is exclusive [OK]

Common Mistakes:

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