以下代码的目的是实现什么排序算法？

def s(data):

for current_position in range(len(data)):

smallest_position = current_position

for next_position in range(current_position + 1, len(data)):

if data[next_position] < data[smallest_position]:

smallest_position = next_position

data[current_position], data[smallest_position] = data[smallest_position], data[current_position]

return data