How to duplicate zeros in place using Python

Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right.

Note that elements beyond the length of the original array are not written.

Do the above modifications to the input array in place, do not return anything from your function.

Examples

Example1:

Input: [1,0,2,3,0,4,5,0]
Output: null
Explanation: After calling your function, the input array is modified to: [1,0,0,2,3,0,0,4]

Example2:

Input: [1,2,3]
Output: null
Explanation: After calling your function, the input array is modified to: [1,2,3]

Writing the code

# declare our function
def duplicateZeros(arr):

    # create our incrementor
    i = 0

    # loop through all dynamic elements
    while i < len(arr)-1:
        # if the character is a zero
        if arr[i]==0:
            # remove the last item from the array
            arr.pop()
            # insert a zero in front of current element
            arr.insert(i+1, 0)
            # move one place forward
            i += 1

        # increment to the next character
        i += 1

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