rowColumnSwap

def rowColumnSwap(pict,k):
#@param:
#   pict: picture;
#   k: int;
    assert getWidth(pict)==getHeight(pict), "Picture is not square"
    assert k<getWidth(pict) and k>=0, "Parameter is smaller than 0 or bigger than picture size."
    for i in range(0,getWidth(pict)):
        pix1 = getPixel(pict,i,k)
        pix2 = getPixel(pict,k,i)
        col1 = getColor(pix1)
        col2 = getColor(pix2)
        setColor(pix1,col2)
        setColor(pix2,col1)