Error in this documentation section: https://docs.python.org/3/tutorial/introduction.html#lists

[diegoahenao]

Error in this documentation section https://docs.python.org/3/tutorial/introduction.html#lists, the following example shows a Deep Copy not a Shallow Copy, slice returns a Deep Copy:

All slice operations return a new list containing the requested elements. This means that the following slice returns a shallow copy of the list:

correct_rgba = rgba[:]
correct_rgba[-1] = "Alpha"
correct_rgba
["Red", "Green", "Blue", "Alpha"]
rgba
["Red", "Green", "Blue", "Alph"]

[gvanrossum]

I'm sorry, you are incorrect. The behavior in your example is a shallow copy. Though honestly, since your list contains immutable values (strings), there is no difference -- you can see the difference in e.g. a list of lists:

a = [[1, 2], [3, 4]]
b = a[:] # Shallow copy
a[0] is b[0] # True
a[1] is b[1] # True
b[1].append(5)
a  # [[1, 2], [3, 4, 5]]