How do I create instances in class using user's input?

Question

I am trying to create any number of instances in a class depending on the user's input but so far I unable to:

class CLASS_INVENTORY:
    maxcount_inventory = int(input("How many Inventories: "))
    for count_inventory in range(maxcount_inventory): 
        def __init__(Function_Inventory, inventory_name(count_inventory)):
            add_inventory = str(input("Enter Inventory #%d: " % (count_inventory+1)))
            inventory_name[count_inventory] = add_inventory

Note: I'm kind of new in Python 3 so I'm not sure if some of my syntax are right.

I want the output to be like this:

How many Inventories: 4
Enter Inventory #1: Fruits
Enter Inventory #2: Veggies
Enter Inventory #3: Drinks
Enter Inventory #4: Desserts

Here's my full code: https://pastebin.com/3FBHgP6i I'd also like to know the rules in writing Python 3 code if I'm following them right or I should change something. I'd like it to be readable as much as possible for other Python programmers.

Stepanjan's answer is accurate for the dynamically-sized array issue, but in terms of Python3 code rules, it is recommended to declare classes as: class ClassName(object):, where object is the type that ClassName sub-classes or implments (which may actually be object, in most cases). In general, it is also recommended to follow the PEP8 guidance. This is easiest followed if you use a text-editor or IDE that supports PEP8 (e.g., Atom with some community plugins and pip packages). — Spencer D
– Spencer D, Commented Oct 3, 2018 at 2:06
Should i use an object here? May i ask your opinion to what i should name my object if i am to add one? — Geni-sama
– Geni-sama, Commented Oct 3, 2018 at 2:15
IMO, no. If the pastebin is your full code, then an array is wholly sufficient for your use-case. Some of the more "OOP-everywhere" community members might disagree, since a class gives you the ability to extend and add data/fields later (e.g., maybe you will add a "Description" member to describe the type of content stored in the inventory), but as it stands right now, putting that in a class is overkill, in my opinion. — Spencer D
– Spencer D, Commented Oct 3, 2018 at 2:37

Ararat Stepanjan · Accepted Answer · 2018-10-03 01:58:08Z

1

class CLASS_INVENTORY():
    maxcount_inventory = int(input("How many Inventories: "))
    inventory=[]
    def __init__(self):
        for count_inventory in range(0, self.maxcount_inventory):
            add_inventory = str(input("Enter Inventory #%d: " % (count_inventory+1)))
            self.inventory.append(add_inventory)

edited Oct 3, 2018 at 1:58

answered Oct 3, 2018 at 1:50

Ararat Stepanjan

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3 Comments

Bryan Oakley Over a year ago

Your answer would be better if you included a small description of what you did differently. Otherwise the reader has to compare your code to the original line-by-line and character-by-character.

Geni-sama Over a year ago

i'd like to add that i need my inventory to be in order. Isn't dictionary and set both random (not in order)?

Spencer D Over a year ago

@Geni-sama, an array, which is what Stepanjan is suggesting, is ordered based on the order the user entered the items.

Bhushan Pant · Accepted Answer · 2018-10-03 02:05:56Z

0

I would do something like this:

# Define class
class CLASS_INVENTORY():
   # On making a class object init will be called
   def __init__(self):
       # It will ask for the inventory type count
       self.maxcount_inventory = int(input("How many Inventories: "))
       self.inventory = []
       # Just loop around it to get the desired result
       for count_inventory in range(0, self.maxcount_inventory):
           add_inventory = str(input("Enter Inventory #%d: " % (count_inventory+1)))
           self.inventory.append(add_inventory)

Output:

CLASS_INVENTORY()
How many Inventories: >? 2
Enter Inventory #1: >? Apple
Enter Inventory #2: >? Orange

answered Oct 3, 2018 at 2:05

Bhushan Pant

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2 Comments

Geni-sama Over a year ago

are the added instances in order? aren't dictionaries and sets both random (not in order) when it comes to adding values?

Bhushan Pant Over a year ago

I have used list thus, it will append in order. But if you use dictionary or set it will be random.

vash_the_stampede · Accepted Answer · 2018-10-03 09:31:54Z

You can construct your dicitonary within def _init__(self) then set up a separate method print_inventories with a loop to print while maintaining the order of entry

class Inventory():
    def __init__(self):
        self.inventories = {}
        n = int(input('How many inventories: '))
        for i in range(1, n+1):
            self.inventories[i] = input('Enter inventory #{}: '.format(i))

    def print_inventories(self):
        for k in self.inventories:
            print('#{}: {}'.format(k, self.inventories[k]))

a = Inventory()
a.print_inventories()

How many inventories: 4
Enter inventory #1: Fruits
Enter inventory #2: Veggies
Enter inventory #3: Drinks
Enter inventory #4: Desserts
#1: Fruits
#2: Veggies
#3: Drinks
#4: Desserts

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