列表，For循环，范围，索引

Question

def garden(seedList):
  flower = [2, 5, 12]
  flowers = []
  for each in range(len(seedList)):
    totalFlowers = flowers.append(seedList[each] * flower[each])
    x = sum(totalFlowers)
  return totalFlowers

我收到错误消息： The error was:iteration over non-sequence Inappropriate argument type. An attempt was made to call a function with a parameter of an invalid type. This means that you did something such as trying to pass a string to a method that is expecting an integer. The error was:iteration over non-sequence Inappropriate argument type. An attempt was made to call a function with a parameter of an invalid type. This means that you did something such as trying to pass a string to a method that is expecting an integer.

我需要解决的问题：

编写一个函数，根据给定每种花的种子数量，计算出花的总量。 seedList参数将包含您拥有的种子数量。 每粒种子都会产生一定数量的花。 一颗矮牵牛种子将产生2朵花，一颗雏菊种子将产生5朵花。 一朵玫瑰种子将产生12朵花。每种花的种子。 seedList参数将包含您拥有的种子数量。 您应该返回一个整数，其中包含您在花园中将要开花的总数。

Answer 1

问题是list.append修改列表到位并返回None 。

totalFlowers = flowers.append(seedList[each] * flower[each])

因此，您的代码实际上正在执行：

x = sum(None)

您的代码的有效版本：

def garden(seedList):
  flower = [2, 5, 12]
  flowers = []
  for each in range(len(seedList)):
      flowers.append(seedList[each] * flower[each])

  return sum(flowers)

使用zip更好的解决方案：

def garden(seedList):
  flower = [2, 5, 12]
  totalFlowers = sum ( x*y for x,y in zip(flower, seedList) )
  return totalFlowers