Python id() Function

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Python id() Function

Python id() function returns an identity of an object. This is an integer which is guaranteed to be unique. This function takes an argument an object and returns a unique integer number which represents identity. Two objects with non-overlapping lifetimes may have the same id() value.


  • id (object)


object : It is an object of which id is to be returned.


It returns a unique integer number.

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

Python id() Function Example 1

  • # Python id() function example
    # Calling function
    val = id(“Javatpoint”) # string object
    val2 = id(1200) # integer object
    val3 = id([25,336,95,236,92,3225]) # List object
    # Displaying result


  • 139963782059696

Python id() Function Example 2

  • # Python id() function example
    class Student:
    def __init__(self, id, name): = id = name

    student = Student(101,”Mohan”)
    # Calling function
    val = id(student) # student class object
    # Displaying result
    print(“Object id:”,val)


  • 101
    Object id: 140157155861392

Python id() Function Example 3

  • # Python id() function example
    l1 = [1,2,3,4]
    l2 = [1,2,3,4]
    l3 = [3,5,6,7]
    # Calling function
    id1 = id(l1)
    id2 = id(l2)
    id3 = id(l3)
    # Displaying result
    # Objects with the same values can have different ids
    # l1 and l2 returns True, while id1 and id2 returns False


  • True False
    False False

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