Python isinstance() Built in Function

The isinstance() function checks whether an object is an instance of a specified class or type. It returns True if the object belongs to the class or type, otherwise False.

Here are some examples of using the isinstance() function:

# Example 1: Check for built-in types
mystr = "Hello World"
num = 100
flt = 10.2
print(isinstance(mystr, str)) # True
print(isinstance(mystr, int)) # False
print(isinstance(num, int)) # True
print(isinstance(num, str)) # False
print(isinstance(flt, float)) # True
print(isinstance(flt, int)) # False

# Example 2: Check for multiple types using a tuple
mylist = [1, 2, 3]
mytuple = (4, 5, 6)
myset = {7, 8 ,9}
print(isinstance(mylist, (list, tuple))) # True
print(isinstance(mytuple, (list, tuple))) # True
print(isinstance(myset, (list ,tuple))) # False

# Example 3: Check for custom classes using inheritance
class Animal:
    pass

class Dog(Animal):
    pass

class Cat(Animal):
    pass

class Bird:
    pass

dog = Dog()
cat = Cat()
bird = Bird()

print(isinstance(dog ,Animal)) # True
print(isinstance(cat ,Animal)) # True
print(isinstance(bird ,Animal)) # False

If you have any questions about this code, you can drop a line in comment.

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