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In-Depth Python OOP

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isinstance()

The isinstance() (is instance) is a Python built-in function that checks object is an instance of a certain class and return the bool value (True or False). This function takes 2 arguments: instance and class:


              
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print(isinstance(662, int))
print(isinstance(25.3, int))
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You can use this function to check your instances:


              
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class User:
  pass

user = User()

print(isinstance(user, User))
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issubclass()

The issubclass() (is subclass) is a Python built-in function that checks class is a Child of another class:


              
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class First:
    pass

class Second(First):
    pass

class Third(Second):
    pass

print(issubclass(Second, First))
print(issubclass(Third, First))
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The issubclass() function works with classes only. If you want to check the instance, use the type() function inside the issubclass():


              
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class A:
    pass

class B(A):
    pass

instance = B()

print(issubclass(type(instance), A))
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