列表,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: 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,根据每种花的种子数计算花的总量.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朵.一个矮牵牛种子将产生2朵花.一朵雏菊种子将产生5朵花.一粒玫瑰种子将生产12种花.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的鲜花总数.

Answer 1

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在做:

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)

更好的解决方案使用zip:

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