What is the difference between list and list[:] in python?

Question

https://code.sololearn.com/cH9QLZPtElbl/?ref=app

Why outputs are note the same for the two lists b and c ?

Answer 1

Try the following:

a = [1, 2, 3]

b = a
print(b == a)
print(b is a)
# they’re the same object
# they are identical

c = a[:]
print(c == a)
print(c is a)
# they have the same values
# they are equal

That means that changing b will also change a, while c is a different (yet equal) object.

Answer 2

Even if b is just a copy of a, the operation b[1][1]=6 have affected a but b[0]=6 doesn't.