<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_row_min_height(self, y: int, min_height: int):
 """Sets a minimum height for blocks in the row with coordinate y."""

        if y < 0:
            raise IndexError('y < 0')
        self._min_heights[y] = min_height