Does this help if you want to appending in list?

Snippet:

rgb_values = []

for idd in range(0, 255, 1):
    value1 = int(255 * col_map.colors[idd][0])
    value2 = int(255 * col_map.colors[idd][1])
    value3 = int(255 * col_map.colors[idd][2])
    rgb_values.append((value1, value2, value3))