R语言编程，需要完整解题步骤

Question

3.2.3

question：Return to the first representation of the Rectangle class example of Section 3.2.3 and write a validity method that ensures that the value placed in the area slot is indeed the product of the width and the height.

Answer 1

def validity(self):
if self.area != self.width * self.height:
return False
else:
return True