Inheritance.

def setup():
   a = Students("Gun", 26, 70, 1.74, 30024)
   b = Students("Rit", 25, 60, 1.70, 30076)
   c = Students("Frame", 19, 58.2, 1.73, 30058)
   d = Students("Boat", 16, 65, 1.68, 30020)
   BMI(a)

class Person:
   def __init__(self,name,age,widht,height):
      self.name = name
      self.age = age
      self.widht = widht
      self.height = height
     
   def get_name(self):
      return self.name
 
   def get_age(self):
      return self.age
 
   def get_widht(self):
      return self.widht
 
   def get_height(self):
      return self.height
 
class Students(Person):
   def __init__(self,name,age,widht,height,ID):
      super().__init__(name,age,widht,height)
      self.ID = ID
     
   def get_ID(self):
      return self.ID

def BMI(data_per):
   BMI = data_per.get_widht()/(data_per.get_height()*data_per.get_height())
   print(BMI)
 
setup()