def derivative(plist):
    """\
    Return a new plist corresponding to the derivative of the input plist.
    """
    new = []
    if not plist: return new
    for i in range(1,len(plist)): new.append(i*plist[i])
    return new
    Return a new plist corresponding to the derivative of the input plist.
    
recipes/Python/362193_Manipulate_simple_polynomials/recipe-362193.py