leetcode1089

 1 class Solution:
 2     def duplicateZeros(self, arr: List[int]) -> None:
 3         """
 4         Do not return anything, modify arr in-place instead.
 5         """
 6         n = len(arr)
 7         if n > 0:
 8             i = 0
 9             while i < n - 1:
10                 if arr[i] == 0:
11                     for j in range(n-2,i,-1):
12                         arr[j+1] = arr[j]
13                     arr[i+1] = 0
14                     i += 2
15                 else:
16                     i += 1