Python: create a function calling a class attribute

Question

I have the following script:

 #we create a class for a product and its description

class Producto:
    def __init__(self, id_producto, linea_produccion, eval_numerica, eval_visual):
        self.id_producto = id_producto
        self.linea_produccion = linea_produccion
        self.eval_numerica = eval_numerica
        self.eval_visual = eval_visual



#here I enter product´s description
def lee_producto():
    id_producto = input()
    linea_produccion = input()
    eval_numerica = (float(input()))
    verificacion = input()
    eval_visual = ( verificacion == "s" )
    return Producto(id_producto, linea_produccion, eval_numerica, eval_visual)

#We call the previous function and add products
def lee_y_anade_producto(lista):
    nuevo_producto = lee_producto()
    lista.append(nuevo_producto)

#we call the previous function as many times as n
lista = []
n = int(input("cuantos productos vas a dar de alta:   ")) 
for i in range(n):
    lee_y_anade_producto(lista)

So far all that I have done is to feed information to my Class object, I don´t know how to do it backward, now that I have the information the way I want it How can I access to it, depending on the piece of information I want?

Show all products in a line (that's self.linea_produccion a1, b2,c3) and show all items depending on what line I choose (a1, b2, c3)

. 2. And I need to calculate self.eval_numeric average of all items, regardless of everything else.

This is for learning purposes, I really want to understand how to and not just copy-paste.

I'm not sure I understand what you're asking, can you explain things differently, perhaps? — AMC
– AMC, Commented Mar 10, 2020 at 0:52
@AMC I know how to input data to a class object, now I need to extract that data — René Martínez
– René Martínez, Commented Mar 10, 2020 at 3:57
You just didn't know how to access the attributes of an object, is that all? — AMC
– AMC, Commented Mar 10, 2020 at 16:55

Rob Kwasowski · Accepted Answer · 2020-03-10 00:17:49Z

1

In your example you have lista which is a list of your Producto objects. This is what you have:

lista = []
n = int(input("cuantos productos vas a dar de alta:   ")) 
for i in range(n):
    lee_y_anade_producto(lista)

After this you can iterate through the list and get the attributes of each object like this:

for object in lista:
    id_producto = object.id_producto
    linea_produccion = object.linea_produccion

Anything that is set as self.attribute in __init__ can be called by object.attribute.

edited Mar 10, 2020 at 0:17

answered Mar 10, 2020 at 0:06

Rob Kwasowski

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4 Comments

René Martínez Over a year ago

But here I´m creating a list, using lista=[], and that list stores n products does that list keeps the same structure as the class object?

Rob Kwasowski Over a year ago

@RenéMartínez I've edited to answer your comment. Please try my suggestion and let me know if it works.

René Martínez Over a year ago

it did work, but I have anoter question, Why does print(lista.id_producto) gives error? shouldn´t that print all list´s id_producto?

Rob Kwasowski Over a year ago

@RenéMartínez lista is a list of objects so it does not have the attribute id_producto. You can access an individual object inside the list with an index, like this: lista[0].id_producto

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