Python is an object-oriented programming language, and in Python everything is an object

Variable

Variable is for naming an object

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2
3
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a, b = 3, 2
print(a, b)
a, b = b, a
print(a, b)

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2

3, 2
2, 3

id(): python object’s real memory location

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a = 5
print(id(a))
b = 5
print(id(b)

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2

1946757065136
1946757065136

b does not made new object
A object made by a = 5 command and b = 5 command just renamed A object.

~~call by value reference on 2-5 ~~