A = ((200, 1.26), ((100, 2.32), (200, 2.32)))
B = ((200, 2.27), (200, 2.05))
C = ((200, 1.35), ((150, 1.8), (200, 1.8)))
D = ((200, 2.27), (200, 1.35), (200, 2.05))
E = (( 200, 2.27), (200, 1.35), ((150, 1.8), (200, 1.8)))
元组中包含元组,数量不确定,层数只有两层,怎么能优雅的把元组中所有的那个小数(位置固定的)取出来?