Move Zeros

Approach:
Step 1 Take the array
Step 2 Keep a pointer pos = 0
Step 3 Traverse array
Step 4 If element not zero place it at pos and move pos
Step 5 Fill remaining positions with 0

Why this works???
Non zero elements move forward in same order
zeros automatically shift to end
no extra space used

Code:
def moveZeroes(nums):
pos = 0
for i in range(len(nums)):
if nums[i]!=0:
nums[pos]=nums[i]
pos+=1
for i in range(pos, len(nums)):
nums[i]=0

Limitation:
Overwrites array values
but works in place