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IS

Import packages

from copy import deepcopy

Checking if two variables point to the same object in memory can be done using the is operator. This is different from the == operator, which checks for value equality. The is operator checks for identity, meaning it checks if both operands refer to the same object in memory.

Define a and b

a = [1, 2, 3, 4]
b = [1, 2, 3, 4]
a == b

True

a and b are same object in memory?

a is b, id(a), id(b)

(False, 124015494187328, 124015493703040)

c and b have equal values?

c = b
c == b

True

c and b are same object in memory?

c is b, id(c), id(b)

(True, 124015493703040, 124015493703040)

c and d have equal values?

d = deepcopy(c)
c == d

True

c and d are same object in memory?

c is d, id(c), id(d)

(False, 124015493703040, 124015494012416)

Define x and y

x = 2
y = x
x, y

(2, 2)

x and y have equal values?

x == y

True

x and y are same object in memory?

x is y, id(x), id(y)

(True, 107491941438136, 107491941438136)

x = 3
x, y

(3, 2)

x and y have equal values?

x == y

False

x and y are same object in memory?

x is y, id(x), id(y)

(False, 107491941438168, 107491941438136)

Change y

y = 6
x, y

(3, 6)