列表，For循環，范圍，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

我收到錯誤消息： 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.

我需要解決的問題：

編寫一個函數，根據給定每種花的種子數量，計算出花的總量。 seedList參數將包含您擁有的種子數量。 每粒種子都會產生一定數量的花。 一顆矮牽牛種子將產生2朵花，一顆雛菊種子將產生5朵花。 一朵玫瑰種子將產生12朵花。每種花的種子。 seedList參數將包含您擁有的種子數量。 您應該返回一個整數，其中包含您在花園中將要開花的總數。

Answer 1

問題是list.append修改列表到位並返回None 。

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

因此，您的代碼實際上正在執行：

x = sum(None)

您的代碼的有效版本：

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更好的解決方案：

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