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id() function in Python
  • Last Updated : 25 Nov, 2017

Introduction
id() is an inbuilt function in Python.
Syntax:

id(object)

As 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 the lifetime. Two objects with non-overlapping lifetimes may have the same id() value. If we relate this to C, then they are actually the memory address, here in Python it is the unique id. This function is generally used internally in Python.

Examples:

The output is the identity of the 
object passed. This is random but 
when running in the same program, 
it generates unique and same identity. 

Input : id(1025)
Output : 140365829447504
Output varies with different runs

Input : id("geek")
Output : 139793848214784




# This program shows various identities
str1 = "geek"
print(id(str1))
  
str2 = "geek"
print(id(str2))
  
# This will return True
print(id(str1) == id(str2))
  
# Use in Lists
list1 = ["aakash", "priya", "abdul"]
print(id(list1[0]))
print(id(list1[2]))
  
# This returns false
print(id(list1[0])==id(list1[2]))


Output:

140252505691448
140252505691448
True
140252505691840
140252505739928
False

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