OOPs.py

# =====================Prob1=====================
'''
Given:
	College Class (an Abstract class)
	Person Class (an Abstract class)
 To Implement:
	Prof(Person):
	IIT(College):
	
 class College(ABC):
 
	
 Follow ups:
   * How will you ensure that two IITs with same name is not created ? If created, raise an exception
	=> implement __eq__(self, other)
   * How will you ensure not too many IITs are built ? 
	=> implement a __len__ method and have a class variable (number of active IITs) that increases on creating a instance
   * How will your model be updated if some IITs are closed ?
	=> implement a __del__ method that decreases the global count of number of active IITs
   * why does first work but second fails ?
		c1 = College('abc')
		c2 = College('abc')
		del c2
		c3 = College('abc')


		c1 = College('abc')
		c2 = College('abc')
		l = [c1, c2]
		del c2
		c3 = College('abc')
	=> __del__ is called only if all reference to an object is removed, in second, even if del c2 is called, l[1] 
	refers to the object and so __del__ is not called

		
   * How will your model updated if prof is allowed to teach more than 1 sub ?
	
	
	
'''