Paste - sum

m = [[1,2,3], [4,5,6], [7,8,9]]

for row in m:
    result = sum(row)
    print(result)

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m = [[1,2,3], [4,5,6], [7,8,9]]

all_results = []

for row in m:
    result = sum(row)
    all_results.append(result)

print(all_results)