Identity Operators in Python (IS, IS NOT) - Python Tutorial for Beginners
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🖥️ Types of Operators in Python - Identity Operators in Python
Depending upon the type of operations you want to perform, there are 7 types of operators in Python: Arithmetic operators, Assignment operator, Comparison operators, Logical operators, Bitwise operators, Identity operators and Membership operators.
○ Identity Operators in Python - IS, IS NOT
Identity Operators, is and is not, are used to compare two values, or variables: not if they are equal, but if they are actually the same Object, located on the same part of the memory. Hence, the 2 variables that are equal does not necessarily imply that they are identical — with de same identity!
Operator | Meaning | Example
is | True operands are identical (same object) | x is True
is not | True if operands are not identical (not the same object) | x is not True
Here is an example of 2 objects that are equal, but not identical. x and y both refer to objects whose value is 5: they are equal. But they do not reference the same object, as you can verify: x and y do not have the same identity, and "x is y" returns False.
OUTPUT
x = 5 5
y = 4 + 1 5
OUTPUT
x == y True
x is y False
You saw previously that when you make an assignment like "x = y", Python merely creates a second reference, to the same object - and you could confirm that fact with the id() function. You can also confirm it, using the "is" operator.
OUTPUT
id(x) 60307920
id(y) 60307920
In this specific case, since a and b reference the same object, it stands to reason that a and b would be equal, as well.
a = "I am a string"
b = a
OUTPUT
id(a) 55993992
id(b) 55993992
OUTPUT
a is b True
a == b True
Unsurprisingly, the opposite of "is", is "is not":
x = 5
y = 4 + 1
OUTPUT
x is not y True
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