Given grid = [[0] * 3 for _ in range(3)], set grid[1][1] = 9 and print grid

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Problem

Given grid = [[0] * 3 for _ in range(3)], set grid[1][1] = 9 and print grid. (This works because each row is a distinct list, unlike the [[0]*3]*3 shallow-copy trap.)

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