The immutable object in python

Question

I see a article about the immutable object.

It says when:
variable = immutable
As assign the immutable to a variable.

for example

Answer 1

"Simple" immutable literals (and in particular, integers between -1 and 255) are interned, which means that even when bound to different names, they will still be the same object.

>>> a = 'foo'
>>> b = 'foo'
>>> a is b
True