它的数据成员包括长(length)和宽(width) 方法成员包括求面积的area()
定义一个名为rectangle的类表示矩形,其中含有length和width两个
里氏替换原则由barbara liskov在1987年提出,它是solid五大面向对象
is a rectangle with sides that are nearly equal in length
barh(y,width,height = 0.8,left = none,*
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