python - 如何遍历列表并搜索多个列表

Question

这些是杂货店清单：

aisle_1 = ['cereals', 'cocoa', 'grits', 'honey', 'oats', 'syrup', 'tea']

aisle_2 = ['apple sauce','canned fruits', 'dried fruits', 'canned juices', 'canned meats', 'prunes', 'raisins', 'canned seafood', 'soup' ]

aisle_3 = ['baking soda', 'cake mixes', 'extracts', 'flour', 'gelatins', 'ketchup', 'mayonnaise', 'meal', 'mustard', 'oils', 'olives', 'pickles','pie crust','salad dressing', 'salt', 'spices', 'sugar', 'vinegar', 'yeast' ]

aisle_4 = ['international foods', 'macaroni', 'canned mushrooms', 'rice', 'meat sauces', 'dried spaghetti', 'tomato paste', 'canned vegetables']

aisle_5 = ['cookies', 'crackers','nuts', 'popcorn', 'potato chips']

aisle_6 = ['matches', 'toilet paper', 'tissue', 'soft drinks', 'toothpicks'] 

aisle_7 = ['ammonia', 'bleaches', 'brooms', 'mops', 'candles', 'disinfectants', 'insectisides', 'moth balls', 'paper towels','napkins','paper plates', 'soap-detergents', 'waxes'] 

aisle_8 = ['dog food', 'light bulbs', 'pet foods', 'toys/games']

aisle_9 = ['baby needs', 'bar soap', 'batteries']

aisle_10 = ['frozen meats', 'frozen meals', 'water'] 

aisle_11 = ['frozen breakfast', 'frozen bread'] 

aisle_12 = ['beer', 'ice cream', 'frozen yogurt', 'popsicles', 'ice'] 

aisle_13 = ['bread', 'candy', 'dairy products', 'jellies', 'margarine', 'marshmallows', 'peanut butter']

rear_left= ['eggs', 'milk', 'yogurt', 'sour cream']

rear_right = ['gluten free']

produce = ['vegetables']

我所要做的就是输入客户想要购买的东西，我已经通过这个循环做到了：

while True:
  shoppinglist = input('enter a grocery item you need:')
  if shoppinglist.lower() == 'quit':
      break
  if shoppinglist.lower() in grocery_items:
      grocery_list.append(shoppinglist) 
  else:
    print('that item is unavailable')

我还已经为grocery_list 发送了空列表，并且有一个名为Grocery_items 的列表，它只是将上面的每个列表与+ 组合在一起。最后，我为每个过道设置了另一个空列表。前任。a1 = [] a2 = []。

我的问题是我必须创建一个遍历购物清单的 FOR 循环，并且该循环必须将列表中的每个项目添加到每个过道的空变量中。例如， aisle_1 包含蜂蜜，因此如果grocery_list 包含蜂蜜，则应将其添加到空列表a1 中。

这就是我想出的：

for item in grocery_list:
  if item.lower in aisle_1:
    a1.append(item)
  if item.lower in aisle_2:
    a2.append(item)
  if item.lower in aisle_3:
    a3.append(item)
  if item.lower in aisle_4:
    a4.append(item)
  if item.lower in aisle_5:
    a5.append(item)
  if item.lower in aisle_6:
    a6.append(item)
  if item.lower in aisle_7:
    a7.append(item)
  if item.lower in aisle_8:
    a8.append(item)
  if item.lower in aisle_9:
    a9.append(item)
  if item.lower in aisle_10:
    a10.append(item)
  if item.lower in aisle_11:
    a11.append(item)
  if item.lower in aisle_12:
    a12.append(item)
  if item.lower in aisle_13:
    a13.append(item)
  if item.lower in rear_left:
    rear_l.append(item)
  if item.lower in rear_right:
    rear_r.append(item)
  if item.lower in produce:
    prod.append(item)

出于某种原因，这整件事被忽略了，当我打印一个应该更改的列表时，它只是显示为空。例如，用户输入蜂蜜和沙粒，在 For 循环中，它应该遍历列表并看到蜂蜜在通道一并将其添加到 a1，然后看到沙粒也在通道一并将其添加到 a1。我不知道为什么它没有将它添加到每个列表中。

我目前拥有的最终代码：

aisle_1 = ['cereals', 'cocoa', 'grits', 'honey', 'oats', 'syrup', 'tea']

aisle_2 = ['apple sauce','canned fruits', 'dried fruits', 'canned juices', 'canned meats', 'prunes', 'raisins', 'canned seafood', 'soup' ]

aisle_3 = ['baking soda', 'cake mixes', 'extracts', 'flour', 'gelatins', 'ketchup', 'mayonnaise', 'meal', 'mustard', 'oils', 'olives', 'pickles','pie crust','salad dressing', 'salt', 'spices', 'sugar', 'vinegar', 'yeast' ]

aisle_4 = ['international foods', 'macaroni', 'canned mushrooms', 'rice', 'meat sauces', 'dried spaghetti', 'tomato paste', 'canned vegetables']

aisle_5 = ['cookies', 'crackers','nuts', 'popcorn', 'potato chips']

aisle_6 = ['matches', 'toilet paper', 'tissue', 'soft drinks', 'toothpicks'] 

aisle_7 = ['ammonia', 'bleaches', 'brooms', 'mops', 'candles', 'disinfectants', 'insectisides', 'moth balls', 'paper towels','napkins','paper plates', 'soap-detergents', 'waxes'] 

aisle_8 = ['dog food', 'light bulbs', 'pet foods', 'toys/games']

aisle_9 = ['baby needs', 'bar soap', 'batteries']

aisle_10 = ['frozen meats', 'frozen meals', 'water'] 

aisle_11 = ['frozen breakfast', 'frozen bread'] 

aisle_12 = ['beer', 'ice cream', 'frozen yogurt', 'popsicles', 'ice'] 

aisle_13 = ['bread', 'candy', 'dairy products', 'jellies', 'margarine', 'marshmallows', 'peanut butter']

rear_left= ['eggs', 'milk', 'yogurt', 'sour cream']

rear_right = ['gluten free']

produce = ['vegetables']
#Define the empty lists or variables you may need.
#You will need an empty list for the user inputed grocery list
#Also a blank list for each aisle that corresponds to the aisles above. This is where your grocery list items will be separated by aisle.
#You will also need a list that combines the items from the aisles above into one big list. 
grocery_list = []

a1 = []
a2 = []
a3 = []
a4 = []
a5 = []
a6 = []
a7 = []
a8 = []
a9 = []
a10 = []
a11 = []
a12 = []
a13= []
rear_r = []
rear_l = []
prod = []

grocery_items = aisle_1 + aisle_2 + aisle_3 + aisle_4 + aisle_5 + aisle_6 + aisle_7 + aisle_8 + aisle_9 + aisle_10 + aisle_11 + aisle_12 + aisle_13 + rear_right + rear_left + produce

#Construct a while loop that takes user input
#If the user enters "quit" stop the loop
#If the grocery item is available in the store, add it to your grocery list 
#If a item is not available in the store, print a message stating it is unavailable

while True:
  shoppinglist = input('enter a grocery item you need:')
  if shoppinglist.lower() == 'quit':
      break
  if shoppinglist.lower() in grocery_items:
      grocery_list.append(shoppinglist) 
  else:
    print('that item is unavailable')

#Print your entire grocery list
print('This is your grocery list: ', grocery_list)

#Construct a for loop that iterates through the grocery list
#Each item in the grocery list should be added to a blank list that corresponds to an aisle from the store
for item in grocery_list:
  if item.lower in aisle_1:
    a1.append(item)
  if item.lower in aisle_2:
    a2.append(item)
  if item.lower in aisle_3:
    a3.append(item)
  if item.lower in aisle_4:
    a4.append(item)
  if item.lower in aisle_5:
    a5.append(item)
  if item.lower in aisle_6:
    a6.append(item)
  if item.lower in aisle_7:
    a7.append(item)
  if item.lower in aisle_8:
    a8.append(item)
  if item.lower in aisle_9:
    a9.append(item)
  if item.lower in aisle_10:
    a10.append(item)
  if item.lower in aisle_11:
    a11.append(item)
  if item.lower in aisle_12:
    a12.append(item)
  if item.lower in aisle_13:
    a13.append(item)
  if item.lower in rear_left:
    rear_l.append(item)
  if item.lower in rear_right:
    rear_r.append(item)
  if item.lower in produce:
    prod.append(item)
    
#Print the aisle names and the grocery list items on each aisle
#dont worry about this part ik how to do this

最后，如果我添加打印 a1，而不是打印应该在过道一的杂货，它只打印一个空白。前任。[]

标签： pythongoogle-colaboratory

Answer 1

确保您使用的是 item.lower() 而不是 item.lower。我还会使用字典，其中键是过道的名称，值是该过道中的项目列表。

inventory = dict()
inventory['aisle_1'] = ['cereals', 'cocoa', 'grits', 'honey', 'oats', 'syrup', 'tea']

inventory['aisle_2'] = ['apple sauce','canned fruits', 'dried fruits', 'canned juices', 'canned meats', 'prunes', 'raisins', 'canned seafood', 'soup' ]

inventory['aisle_3'] = ['baking soda', 'cake mixes', 'extracts', 'flour', 'gelatins', 'ketchup', 'mayonnaise', 'meal', 'mustard', 'oils', 'olives', 'pickles','pie crust','salad dressing', 'salt', 'spices', 'sugar', 'vinegar', 'yeast' ]

inventory['aisle_4'] = ['international foods', 'macaroni', 'canned mushrooms', 'rice', 'meat sauces', 'dried spaghetti', 'tomato paste', 'canned vegetables']

...

inventory['rear_left'] = ['eggs', 'milk', 'yogurt', 'sour cream']

inventory['rear_right'] = ['gluten free']

inventory['produce'] = ['vegetables']

shopping_list = {key: [] for key in inventory.keys()}

#Construct a while loop that takes user input

while True:
  item = input('enter a grocery item you need:')
  if item.lower() == 'quit':
      break
  in_store = False
  for aisle, items in inventory.items():
      if item.lower() in items:
          shopping_list[aisle].append(item)
          in_store = True
          break
  if not in_store:
      print('item not available')