```
class Solution(object):
def moveZeroes(self, nums):
"""
:type nums: List[int]
:rtype: void Do not return anything, modify nums in-place instead.
"""
n = len(nums)
i, j = 0, 0
while True:
while (i<n) and (not nums[i]==0):
i+=1
if i==n: return
j=i+1
while (j<n) and (nums[j]==0):
j+=1
if j==n: return
nums[i], nums[j] = nums[j], nums[i]
```

By the way, if it wasn't required to do it in-place, then simple one liner is OK.

```
return [n for n in nums if not n==0] + [n for n in nums if n==0]
```