Intricacies of Aliasing

[ClassicalSoul]

Hi,

Typically aliasing is done by assigning the 'original' variable to some other variable. But I was exploring the intricacies of aliasing, and am wondering what might explain the following phenomenon:

>>> x = 5
>>> y = 5
>>> id(x) == id(y)
True
>>> x = 'hi'
>>> y = 'hi'
>>> id(x) == id(y)
True
>>> x = [1]
>>> y = [1]
>>> id(x) == id(y)
False

Thanks