In Python, id() function is a built-in function that returns the unique identifier of an object. The identifier is an integer, which represents the memory address of the object. The id() function is commonly used to check if two variables or objects refer to the same memory location.
Python id() Function Syntax
Syntax: id(object)
Return: a unique integer for a given object
How id() Function Work?
In this example, we can see the function accepts a single parameter and is used to return the identity of an object. This identity has to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same id() value. If we relate this to C, they are the memory address, here in Python it is the unique ID. This function is generally used internally in Python.
Python3
x = 42
y = x
z = 42
print(id(x))
print(id(y))
print(id(z))
|
Output
140642115230496
140642115230496
140642115230496
Python id() function Examples
Below are the ways with which we can use id() function in Python:
- Inbuilt DataTypes
- Custom Object
- With Sets
- With Tuples
Python id() for Inbuilt DataTypes
In this example, we are printing the id of multiple datatypes like strings and lists to get object identity in Python
Python3
str1 = "geek"
print(id(str1))
str2 = "geek"
print(id(str2))
print(id(str1) == id(str2))
list1 = ["aakash", "priya", "abdul"]
print(id(list1[0]))
print(id(list1[2]))
print(id(list1[0])==id(list1[2]))
|
Output
140161148229168
140161148229168
True
140161147809712
140161147916400
False
Python id() for custom object
In this example, we are creating the Python class and we are creating two Python class objects and checking their ids to get object identity in Python.
Python3
class MyClass:
pass
obj1 = MyClass()
obj2 = MyClass()
print(id(obj1))
print(id(obj2))
|
Output
140225741483792
140225741483856
Python id() with Sets
In this example, we are using the id function on sets to get object identity in Python.
Python3
set1 = {1, 2, 3}
set2 = {3, 2, 1}
set3 = {1, 2, 3}
print(id(set1))
print(id(set2))
print(id(set3))
|
Output
140483509094352
140483509093872
140483509095792
Python id() with Tuples
In this example, we are using the id function on tuples to get object identity in Python.
Python3
tuple1 = (1, 2, 3)
tuple2 = (3, 2, 1)
tuple3 = (1, 2, 3)
print(id(tuple1))
print(id(tuple2))
print(id(tuple3))
|
Output
140544960491680
140544960107456
140544960491680
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Last Updated :
29 Nov, 2023
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