print("Hello! We have the following products in stock: ")
print(" ")
stock = [
  {"Product#1": "Donuts", "Price": 17.00, "Stock:": 10},
  {"Product#2": "Triki Trakets", "Price": 11.50, "Stock": 15},
  {"Product#3": "Sausages", "Price": 52.00, "Stock": 7},
  {"Product#4": "Cheese", "Price": 65.00, "Stock": 8},
  {"Product#5": "Coke", "Price": 10.50, "Stock": 25},
  {"Product#6": "Gatorade", "Price": 12.00, "Stock": 15}
        ]
def stonk():
  x = 0
  for product in stock:
    for key, value in product.items():
      print(key, value)
      x  = 1
      if x % 3 == 0:
        print("___")


stonk()

print(" ")
print("Prices after a 5.5% increase:")

The point of this code is to organize in a nice matter data on products in stock and their price. Now that I've arranged the data I need to update it yet I'm not sure how this is done in arrays. How can I increase "prices" by 5.5% using autonomous code?

CodePudding user response：

Since you want to increase all prices by 5.5%, all you need to do is iterate over your list^{NOT array!}, and modify each dictionary to update its "Price" key:

for product in stock:
    product["Price"] *= 1.055

Unrelated to your original question, but your data structure doesn't quite make sense. Why append an integer to the "Product..." key?

1. You already have a list, so it makes no sense to include another index inside the item itself.
2. Having a different structure of each dictionary makes it impossible to access the product name without looking at all the keys in the dictionary and finding one that starts with "Product", which defeats the purpose of a dictionary.

Instead, consider renaming those keys to something uniform that describes what property of your product is specified by that value.

stock = [
  {"Name": "Donuts", "Price": 17.00, "Stock": 10},
  {"Name": "Triki Trakets", "Price": 11.50, "Stock": 15},
  {"Name": "Sausages", "Price": 52.00, "Stock": 7},
  {"Name": "Cheese", "Price": 65.00, "Stock": 8},
  {"Name": "Coke", "Price": 10.50, "Stock": 25},
  {"Name": "Gatorade", "Price": 12.00, "Stock": 15}
]

Now, when you access the dictionaries in your list, you can simply do item["Name"] to get the name of each product. To format your output, you could do something like this:

print("We have the following items in stock:")
print(f"{'Product':<30s}{'Price':>6s}{'Stock':>6s}")
for item in stock:
    print(f"{item['Name']:<30s}{item['Price']:>6.2f}{item['Stock']:>6d}")    

which prints:

We have the following items in stock:
Product                        Price Stock
Donuts                         17.00    10
Triki Trakets                  11.50    15
Sausages                       52.00     7
Cheese                         65.00     8
Coke                           10.50    25
Gatorade                       12.00    15

See the links here and here for more information on the f-string syntax, and python's format specification syntax

If you want each product to have a "product ID", then include that as a separate key for each product.

stock = [
  {"Name": "Donuts", "Price": 17.00, "Stock": 10, "id": 1001},
  {"Name": "Triki Trakets", "Price": 11.50, "Stock": 15, "id": 2001},
  {"Name": "Sausages", "Price": 52.00, "Stock": 7, "id": 3002},
  {"Name": "Cheese", "Price": 65.00, "Stock": 8, "id": 4232},
  {"Name": "Coke", "Price": 10.50, "Stock": 25, "id": 5678},
  {"Name": "Gatorade", "Price": 12.00, "Stock": 15, "id": 6000}
]

Alternatively, consider changing your list stock to a dictionary, where each key is the product ID.

stock_lookup = {item["id"]: item for item in stock}

Now, you can lookup a product by its ID in stock_lookup:

print(stock_lookup[6000]) # {'Name': 'Gatorade', 'Price': 12.0, 'Stock': 15, 'id': 6000}

CodePudding user response：

stock = [
  {"Product#1": "Donuts", "Price": 17.00, "Stock:": 10},
  {"Product#2": "Triki Trakets", "Price": 11.50, "Stock": 15},
  {"Product#3": "Sausages", "Price": 52.00, "Stock": 7},
  {"Product#4": "Cheese", "Price": 65.00, "Stock": 8},
  {"Product#5": "Coke", "Price": 10.50, "Stock": 25},
  {"Product#6": "Gatorade", "Price": 12.00, "Stock": 15}
        ]
def stonk():      
    for product in stock:            
        new_price = ((5.5/100)*product['Price']) product['Price']    
        product['Price'] = new_price

You can update the price by 5.5% using above code.