python - 列表，For循环，范围，索引

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：The error was:iteration over non-sequenceInappropriate 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.
我需要解决的问题是：
编写一个函数，根据每种花的种子数计算花的总数。seedList参数将包含
有。每粒种子都会结出一定数量的花。一个矮牵牛花种子能产生2朵花，一个雏菊种子能产生5朵花。一粒玫瑰种子将产生12朵花。每种花的种子。seedList参数将包含
有。您应该返回一个整数，其中包含您花园中的花的总数。

最佳答案

问题是list.append修改列表并返回None。

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

所以你的代码实际上是：

x = sum(None)

代码的工作版本：

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的更好的解决方案：

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