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Python 3 - Identity Operators Example
Python built-in function id() returns a unique integer as identity of object. Identity operators compare the memory locations of two objects. There are two Identity operators as explained below −
Operator | Description | Example |
---|---|---|
is | Evaluates to true if the variables on either side of the operator point to the same object and false otherwise. | x is y, here is results in 1 if id(x) equals id(y). |
is not | Evaluates to false if the variables on either side of the operator point to the same object and true otherwise. | x is not y, here is not results in 1 if id(x) is not equal to id(y). |
Example
#!/usr/bin/python3 a = 20 b = 20 print ('Line 1','a=',a,':',id(a), 'b=',b,':',id(b)) if ( a is b ): print ("Line 2 - a and b have same identity") else: print ("Line 2 - a and b do not have same identity") if ( id(a) == id(b) ): print ("Line 3 - a and b have same identity") else: print ("Line 3 - a and b do not have same identity") b = 30 print ('Line 4','a=',a,':',id(a), 'b=',b,':',id(b)) if ( a is not b ): print ("Line 5 - a and b do not have same identity") else: print ("Line 5 - a and b have same identity")
Output
When you execute the above program it produces the following result −
Line 1 a= 20 : 1594701888 b= 20 : 1594701888 Line 2 - a and b have same identity Line 3 - a and b have same identity Line 4 a= 20 : 1594701888 b= 30 : 1594702048 Line 5 - a and b do not have same identity
python_basic_operators.htm
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