In python 3.10.1 documentation(The Python Tutorial -> An Informal introduction to Python -> Lists)

 

 

Maybe it should be replaced by “deep copy” ?

 

Here is my try:

Since integers are immutable (and not containers), what you have demonstrated is a shallow copy - in fact a deep and shallow copy are indistinguishable if the container being copied doesn't also contain other containers.

>>> a = [0,1, {2,3}]
>>> b = a [:]
>>> a is b
False
>>> a[2] is b[2]     # Proves this is a shallow copy - a deepcopy would have made a replica of that set (but with the same contents).
True
>>> b[2].add(4)
>>> a, b
([0, 1, set([2, 3, 4])], [0, 1, set([2, 3, 4])])

_______________________________________________
docs mailing list -- docs@python.org
To unsubscribe send an email to docs-leave@python.org
https://mail.python.org/mailman3/lists/docs.python.org/
Member address: anthony.flury@btinternet.com

-- 
Anthony Flury
email : anthony.flury@btinternet.com