Move Zeroes

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

Example:

Input: [0,1,0,3,12]
Output: [1,3,12,0,0]

Note:

1. You must do this in-place without making a copy of the array.
2. Minimize the total number of operations.

My solution:

class Solution:
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        size = len(nums)
        index = 0
        for i in range(size):
            if nums[i] != 0:
                val = nums[i]
                del nums[i]
                nums.insert(index, val)
                index +=1

Good solution:

class Solution:
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        count=nums.count(0)
        nums[:]=[i for i in nums if i != 0]
        nums+=[0]*count