Python isinstance()

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The isinstance() function checks if the object (first argument) is an instance or subclass of classinfo class (second argument).

isinstance() returns:

True if the object is an instance or subclass of a class or any element of the tuple
False otherwise

If classinfo is not a type or tuple of types, a TypeError exception is raised.

class Foo:
a = 5

fooInstance = Foo()
print(isinstance(fooInstance, Foo))

print(isinstance(fooInstance, (list, tuple)))
print(isinstance(fooInstance, (list, tuple, Foo)))

Output:

True
False
True

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