What does mean this Python sintax?

Question

a = [<something>]
a[:] = [<new something>]#why ([:]) used here
?

Answer 1

Alexandr Goncharenko
#case 1
l = [1, 2, 3]
print(id(l))
l[:] = [4, 5]
print(id(l))

#case 2
l1 = [1, 2, 5]
print(id(l1))
l1 = [4, 1]
print(id(l1))

Run above code. case 1 same list memory is updated with new values by using [:].

case 2 show different list has been created when l[:] is not used.

function id is used to print address associated with the variable.

hope it helps.

Answer 2

Similar question.
https://www.sololearn.com/Discuss/2318582/?ref=app

Answer 3

You understood my question. I saw this syntax in the alien code. I didn' t understand why programmer use this syntax, because of this I asked a question

Answer 4

Problem is what code works there with one variable (a). I understood why in second line used ([:])

Answer 5

I don't have problem. I just saw example in one code and I understood mean of this syntax

Answer 6

Ok perfect. Good luck...!!!

Answer 7

Alexandr Goncharenko Not getting. Could you please explain your problem?