Move all negative elements to end in python

Python program for Move all negative elements to end. Here mentioned other language solution.

#  Python 3 program for
#  Move all negative elements at the end of array

#  Display list elements
def display( arr,  n) :
    i = 0
    while (i < n) :
        print(arr[i], end ="  ")
        i += 1
    print()
#  Swap the given list elements
def swap( arr,  start,  end) :
    temp = arr[start]
    arr[start] = arr[end]
    arr[end] = temp
#  Method which is move negative elements
def moveNegative( arr,  n) :
    #  first index
    i = 0
    #  last index
    j = n - 1
    while (i < j) :
        if (arr[i] < 0 and arr[j] >= 0) :
            #  When [i] index are have negative value 
            #  And [j] is positive then swapping elements values
            swap(arr, i, j)
            #  Modified index
            i += 1
            j -= 1
        elif (arr[i] >= 0) :
            #  When element of [i] is not negative
            i += 1
        else :
            j -= 1
def main() :
    #  Array which are containing positive and negative values
    arr = [1, -1, 3, 2, -7, -5, 11, 6]
    n = len(arr)
    print("Before Arrange : ")
    #  Before move element
    display(arr, n)
    #  Move negative elements
    moveNegative(arr, n)
    #  After arrange
    print("After Arrange : ")
    #  After move element
    display(arr, n)


if __name__=="__main__":
    main()

Output

Before Arrange :
1  -1  3  2  -7  -5  11  6
After Arrange :
1  6  3  2  11  -5  -7  -1