list_tracing_2d

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longest_sorted_sequence >

Main Page → Exercises → Python → Solve an Exercise

Language/Type: Python 2D lists list mystery

What are the values of the elements in the list numbers after the following code is executed?

numbers = [[0, 0, 0, 0],
           [0, 0, 0, 0],
           [0, 0, 0, 0]]
for r in range(len(numbers)): 
    for c in range(len(numbers[0])):
        numbers[r][c] = r + c

`numbers[0][0]`
`numbers[0][1]`
`numbers[0][2]`
`numbers[0][3]`
`numbers[1][0]`
`numbers[1][1]`
`numbers[1][2]`
`numbers[1][3]`
`numbers[2][0]`
`numbers[2][1]`
`numbers[2][2]`
`numbers[2][3]`

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