Prints the Pixy blocks data.

def pixy_value_update(current_pan_angle_deg, prev_pan_move_deg, blocks):
    """ Prints the Pixy blocks data."""
    if len(blocks) > 0:
        pan_error = X_CENTER - blocks[0]["x"]
        if math.fabs(pan_error) < 20.0:
            print("Close enough.")
            return current_pan_angle_deg, 0
        pan_move_deg = 1 if pan_error > 0 else -1
        if prev_pan_move_deg > 0 and pan_move_deg > 0:
            pan_move_deg = 3
        if prev_pan_move_deg < 0 and pan_move_deg < 0:
            pan_move_deg = -3
        current_pan_angle_deg += pan_move_deg
        if current_pan_angle_deg > 150:
            current_pan_angle_deg = 150
        if current_pan_angle_deg < 20:
            current_pan_angle_deg = 20
        print("x: {}  pan_error: {}  pan_move_deg: {}  angle: {}".format(blocks[0]["x"], pan_error, pan_move_deg, current_pan_angle_deg))
        return current_pan_angle_deg, pan_move_deg
    return current_pan_angle_deg, 0