A function to move list items.

def move(frm, to, lst):
    """
    Moves an element in a list.
    frm: index to move element from
    to : index to move element to
    lst: the list to be updated
    """
    if to < frm:
        lst.insert(to, lst.pop(frm))
    elif frm < to:
        lst.insert(to+1, lst[frm])
        lst.pop(frm)