Python isinstance() Function

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Python isinstance() Function

Python isinstance() function is used to check whether the given object is an instance of that class. If the object belongs to the class, it returns True. Otherwise returns False. It also returns true if the class is a subclass.

The isinstance() function takes two arguments object and classinfo and returns either True or False. The signature of the function is given below.

Signature

  • isinstance(object, classinfo)

Parameters

object: It is an object of string, int, float, long or custom type.

classinfo: Class name.

Return

It returns boolean either True or False.

Let’s see some examples of isinstance() function to understand it’s functionality.

Python isinstance() Function Example 1

Here, we are passing object and class to the function which returns True only if the object belongs to the class. See the below example.

  • # Python isinstance() function example
    class Student:
    id = 101
    name = “John”
    def __init__(self, id, name):
    self.id=id
    self.name=name

    student = Student(1010,”John”)
    lst = [12,34,5,6,767]
    # Calling function
    print(isinstance(student, Student)) # isinstance of Student class
    print(isinstance(lst, Student))

Output:

  • True
    False

Python isinstance() Function Example 2

  • # Python isinstance() function example
    # Declaring variables
    val = 10
    lst = [12,34,5,6,767]
    name = “Mohan”
    # Calling function
    print(isinstance(val, int)) # isinstance of int class
    print(isinstance(lst, list)) # True
    print(isinstance(name, str)) # True
    print(isinstance(val, list)) # False

Output:

  • True
    True
    True
    False

Python isinstance() Function Example 3

This function also returns True if the object is of subclass and class is a parent class. See, how it works in the below example.

  • # Python isinstance() function example
    # Declaring variables

    class NumericList(list):
    def __init__(self):
    return None

    num = NumericList()
    # Calling function
    print(isinstance(num, NumericList)) # True
    print(isinstance(num, list)) # True

Output:

  • True
    True

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