sudokurowsum.py

summands = [1]
for i in range(9):
    summands.append(summands[-1] * 10)

def rowsum(row):
    return sum(summands[x] for x in row)

valid_sum = rowsum([1, 2, 3, 4, 5, 6, 7, 8, 9])

def is_sudokurow(row):
    return rowsum(row) == valid_sum

print(summands)
print(is_sudokurow([1, 2, 3, 4, 5, 6, 7, 8, 9]))
print(is_sudokurow([8, 2, 5, 4, 3, 6, 7, 1, 9]))
print(is_sudokurow([1, 2, 3, 4, 5, 6, 7, 7, 7]))