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

I am getting error: 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.

The problem that I need to solve:

Write a function that calculates the total amount of flowers given the number of seeds for each type of flower. The seedList parameter will contain the amount of seeds you have. Each seed will produce a certain number of flowers. One petunia seed will produce 2 flowers.One daisy seed will produce 5 flowers. One rose seed will produce 12 flowers.seeds for each type of flower. The seedList parameter will contain the amount of seeds you have. You should return an integer with the total number of flowers you will have in your garden.

Answer 1

Problem is list.append modifies the list in place and returns None .

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

So your code is actually doing :

x = sum(None)

A working version of your code:

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

  return sum(flowers)

A better solution solution using zip :

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