Python-сообщество

Привет!
Подскажите, пожалуйста, с задачей:

Stocking Out

Now you need your compute_bill function to take the stock/inventory of a particular item into account when computing the cost.

Ultimately, if an item isn't in stock, then it shouldn't be included in the total. You can't buy or sell what you don't have!
Instructions

Make the following changes to your compute_bill function:

While you loop through each item of food, only add the price of the item to total if the item's stock count is greater than zero.
If the item is in stock and after you add the price to the total, subtract one from the item's stock count.

?
Hint

If you're buying a banana, check if it's in stock (larger than zero). If it's in stock, add the cost of a banana to your bill. Finally, decrement the stock of bananas by one!

 shopping_list = ["banana", "orange", "apple"]
stock = {
    "banana": 6,
    "apple": 0,
    "orange": 32,
    "pear": 15
}
    
prices = {
    "banana": 4,
    "apple": 2,
    "orange": 1.5,
    "pear": 3
}
# Write your code below!
def compute_bill(food):
    total = 0
    for item in food:
        if stock(item) > 0:
            total = prices[item] + total
        return stock[item] - 1
    return total
   

Oops, try again. calling compute_bill with a list containing 1 apple, 1 pear and 1 banana caused the following error: ‘dict’ object is not callable

Отредактировано hewonders (Авг. 26, 2016 11:13:49)

Покажите как вы вызываете функцию

К примеру например:

     compute_bill("banana")

Oops, try again. calling compute_bill with a list containing 1 apple, 1 pear and 1 banana caused the following error: ‘dict’ object is not callable

hewonders

 return stock[item] - 1

 return stock(item) - 1

Отредактировано Stepan_M (Авг. 26, 2016 13:52:33)

И при квадратный и при круглых скобках

 # Write your code below!
def compute_bill(food):
    total = 0
    for item in food:
        if stock(item) > 0:
            total = prices[item] + total
        return stock(item) - 1
    return total
  

Oops, try again. calling compute_bill with a list containing 1 apple, 1 pear and 1 banana caused the following error: ‘dict’ object is not callable

 if stock[item] > 0:

Отредактировано ZerG (Авг. 26, 2016 16:23:26)

Имелось в виду в

  return stock(item) - 1

  if stock[item] > 0:

Traceback (most recent call last):
File “CUsers/fomichevll/AppData/Local/Programs/Python/Python35/ввввввввв.py”, line 25, in <module>
compute_bill(“banana”)
File “CUsers/fomichevll/AppData/Local/Programs/Python/Python35/ввввввввв.py”, line 21, in compute_bill
if stock > 0:
KeyError: ‘b’

File “python”, line 25
compute_bill(“banana”)
^
IndentationError: unindent does not match any outer indentation level

Если изменить код по аналогии, то получается:

 def compute_bill(food):
    total = 0
    for item in food:
        if (stock[item]) > 0:
            total = (prices[item]) + total
        return (stock[item]) - 1
    return total

Oops, try again. calling compute_bill with a list containing 1 apple, 1 pear and 1 banana resulted in -1 instead of the correct 7

Oops, try again. Your code looks a bit off. See the console window for the error. Check the Hint if you need help!

Traceback (most recent call last):
File “python”, line 25, in <module>
File “python”, line 21, in compute_bill
KeyError: ‘b’

Отредактировано hewonders (Авг. 29, 2016 10:15:58)

Пользуйтесь оператором print() для отладки вашего кода

 # -*- coding: utf-8 -*-
def compute_bill(food):
    total = 0
    for item in food:
        print(item)
compute_bill('pear')

p
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