Python. What does this line do?

Question

Python

Tell me, please, what does line three (Buf = [0]*K) mean in this program.

N = int(input())
K = 7
Buf = [0]*K
for i in range(N):
  elem = int(input())
  next = Buf[i % K] 
  Buf[i % K] = elem
  if i == K:
    maxPrev = next
    maxSum = next + elem
  if i > K:
    maxPrev = max(maxPrev, next)
    maxSum = max(maxSum, maxPrev+elem)

Answer 1

Buf = [0]*K
is equivalent to the following construction:
I.e. Buf is a list, each element of which is 0.

Answer 2

list multiplication. Sit in a shell and practice....
>>> dd = [0] * 7
>>> dd
[0, 0, 0, 0, 0, 0, 0]
>>>