intering int number

[akbarza]

hi
in the below code:

#from: https://realpython.com/python-assignment-operator/
''' to detemine intering range for integers'''

from platform import python_version

interning = [
    x
    for x, y in zip(range(-10, 500), range(-10, 500))
    if x is y
]

print(
    f"Interning interval for Python {python_version()} is:"
    f" [{interning[0]} to {interning[-1]}]"
)

x=-4
y=-4
print(id(x)==id(y))    #True
x=257
y=257
print(id(x)==id(y))   #in shell is  false but in script run results true ?
x=256
y=256
print(id(x)==id(y))    #True

after running( i use Thonny) is:

Output:
Interning interval for Python 3.10.11 is: [-5 to 256]
True
True
True

my issue is about line 22.
in shell if i write:
>>> x=257
>>> y=257
>>> id(x)==id(y)
False

but this is inconsistence with result of running line 22 of the above code.
can explain to me the reason of this?
thanks for any reply.