<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def shape_offset_y(self):
 """Return y distance of shape origin from local coordinate origin. The returned integer represents the topmost extent of the freeform shape, in local coordinates. Note that the bounding box of the shape need not start at the local origin. """

        min_y = self._start_y
        for drawing_operation in self:
            if hasattr(drawing_operation, 'y'):
                min_y = min(min_y, drawing_operation.y)
        return min_y