human
I am working on the file "Section 1 - Core Python/Chapter 09 - Classes & OOPS/OOPs Fundamentals - ABC.ipynb".
The first task is:
Implementation Through Subclassing
Can you write Python program for it?

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Write me a the Python program you requested?
assistant
#Here is the Python program you requested.

from abc import ABCMeta, abstractmethod

class Mammal(metaclass=ABCMeta):
## version 2.x ##     __metaclass__=ABCMeta
    
    @abstractmethod
    def eyes(self, val):
        raise NotImplementedError()

#     @abstractmethod
#     def hand(self):
#         raise NotImplementedError()
    
    def hair(self):
        print("hair")
    
    def neocortex(self):
        """a part of the cerebral cortex concerned with sight and hearing in mammals, 
        regarded as the most recently evolved part of the cortex."""
        print("neocortex")
    
class Human(Mammal):
    def eyes(self, val):
        print("human eyes")

print ('Subclass:', issubclass(Human, Mammal))
print ('Instance:', isinstance(Human(), Mammal))
c = Human()
print ('Instance:', isinstance(c, Mammal))
c.eyes("Gray")