Python id(object)

id() is a built-in function in Python 3, which returns the identity of an object. The identity is a unique integer for that object during its lifetime. This is also the address of the object in memory.



The object argument can typically be a int,float, str,list, dict, tuple etc.

Code Sample

a = 2
print(id(a)) #=> 140454723286976 (Values returned by id() might be different for different users)

b = 3
print(id(b)) #=> 140454723287008

c = 2
print(id(c)) #=> 140454723286976 (This is same as id(a) since they both contain the same value and hence have same memory address)

print(id(a) == id(b)) #=> False (since a and b have different values stored in them)
print(id(a) == id(c)) #=> True (since a and c have same values stored in them)

d = 1.1
e = 1.1 
print(id(d) == id(e)) #=> True (since d and e have same values stored in them)

str1 = 'hello'
str2 = 'hello'
print(id(str1) == id(str2)) #=> True (since str1 and str2 have same values stored in them)

# For complex objects like lists, tuples, dictionaries etc. id() would give a unique integer even if the content of those containers is same.
tup1 = (1,1)
tup2 = (1,1)
print(id(tup1) == id(tup2)) #=> False

🚀 Run Code

Official Docs