Trouble working with and updating dictionary using a class and function in Python 3 [Newbie]

Question

I am somewhat new to coding. I have been self teaching myself for the past year or so. I am trying to build a more solid foundation and am trying to create very simple programs. I created a class and am trying to add 'pets' to a dictionary that can hold multiple 'pets'. I have tried changing up the code so many different ways, but nothing is working. Here is what I have so far.

# Created class
class Animal:

# Class Attribute
classes = 'mammal'
breed = 'breed'

# Initializer/Instance Attribrutes
def __init__ (self, species, name, breed):
    self.species = species
    self.name = name
    self.breed = breed

# To get different/multiple user input
@classmethod
def from_input(cls):
    return cls(
            input('Species: '),
            input('Name: '),
            input('Breed: ')
            )

# Dictionary
pets = {}

# Function to add pet to dictionary
def createpet():
    for _ in range(10):
        pets.update = Animal.from_input()
        if pets.name in pets:
            raise ValueError('duplicate ID')

# Calling the function
createpet()

I have tried to change it to a list and use the 'append' tool and that didn't work. I am sure there is a lot wrong with this code, but I am not even sure what to do anymore. I have looked into the 'collections' module, but couldn't understand it well enough to know if that would help or not. What I am looking for is where I can run the 'createpet()' function and each time add in a new pet with the species, name, and breed. I have looked into the sqlite3 and wonder if that might be a better option. If it would be, where would I go to learn and better understand the module (aka good beginner tutorials). Any help would be appreciated. Thanks!

henriman · Accepted Answer · 2018-02-15 18:00:47Z

0

(First of all, you have to check for a duplicate before you add it to the dictionary.)
The way you add items to a dictionary x is

x[y] = z

This sets the value with the key y equal to z or, if there is no key with that name, creates a new key y with the value z.
Updated code:
(I defined this as a classmethod because the from_input method is one as well and from what I understand of this, this will keep things working when it comes to inheriting classes, for further information you might want to look at this)

@classmethod
def createpet(cls):
    pet = cls.from_input()
    if pet.name in cls.pets:
        raise ValueError("duplicate ID")
    else:
        cls.pets[pet.name] = pet

answered Feb 15, 2018 at 18:00

henriman

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