小编Tyc*_*sma的帖子

您好，我正在尝试计算列表中的增长率（以百分比表示）

def growth():

   population = [1, 3, 4, 7, 8, 12]

   # new list for growth rates
   growth_rate = []

   # for population in list
   for pop in population:

       gnumbers = ((population[pop] - population[pop-1]) / population[pop-1] * 100)
       growth_rate.append(gnumbers)
       print growth_rate

growth()

但它在这里给了我一个索引错误（gnumbers）“IndexError，索引超出范围”