<Class> Object has no attribute <attribute_name>

Question

So, i'm new to python and been stuck many hours facing an error when trying run the code bellow

class ConjuntoDeInteiros:
    def _init_(self, conjunto, storage_capacity=100): #initializes a list and its length, default value is 100
        self.storage_capacity = storage_capacity
        self.conjunto = [None] * storage_capacity

    def addElement(self, intNumber): #add an element to the list
        self.conjunto.append(intNumber)

    def union(self, instanceOfConjuntoDeInteiros): #returns the union of an instance list with another instance list
        return self.conjunto + instanceOfConjuntoDeInteiros

if __name__ == '__main__':
    c1 = ConjuntoDeInteiros()
    c2 = ConjuntoDeInteiros()
    c1.addElement(10)
    c2.addElement(5)
    c1.union(c2)

error: Traceback (most recent call last): File "", line 15, in File "", line 7, in addElement AttributeError: 'ConjuntoDeInteiros' object has no attribute 'conjunto'

What am i doing wrong???

_init_ -> __init__, use two underscores on each side

juanpa.arrivillaga
– juanpa.arrivillaga

2021-11-18 22:44:29 +00:00
Commented Nov 18, 2021 at 22:44 — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Nov 18, 2021 at 22:44

jezza_99 · Accepted Answer · 2021-11-18 22:45:44Z

3

Your init function is wrong. It needs to be __init__ and you have _init_. Therefore your self.conjunto is never defined and hence your error. You also have conjunto and storage_capacity as parameters of __init__, but you don't pass them when creating ConjuntoDeInteiros().

answered Nov 18, 2021 at 22:45

jezza_99

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4 Comments

user11717481 Over a year ago

Not really necessary because the Python constructor works in that way.

Elisson G. M. Silva Over a year ago

@jezza_99 Thank you!!! It worked! I didn't noticed the typo ahaha

jezza_99 Over a year ago

@h.devillefletcher I understand that you can call parameter=value in __init__, but conjunto still requires a user parameter as it isn't defined

user11717481 Over a year ago

that`s right! and might not be a necessary parameter in this case...

user11717481 · Accepted Answer · 2021-11-19 07:54:17Z

The error that it shows you is caused because you are trying to add an instance of class ConjuntoDeInterios(), if you want to join the list of the other class with the current defined class you need to overload the operator+ on ConjuntoDeInterios() by this way:

class ConjuntoDeInteiros:
    def __init__(self, conjunto=[None], storage_capacity=100): #initializes a list and its length, default value is 100
        self.storage_capacity = storage_capacity
        self.conjunto = [None] * storage_capacity

    # overload operator (+)
    def __add__(self, instanceOfConjuntoDeInteiros): # returns the union of an instance list with another instance list
        return self.conjunto + instanceOfConjuntoDeInteiros.conjunto

    def addElement(self, intNumber): # add an element to the list
        self.conjunto.append(intNumber)

if __name__ == '__main__':
    c1 = ConjuntoDeInteiros()
    c2 = ConjuntoDeInteiros()
    c1.addElement(10)
    c2.addElement(5)
    print(c1 + c2)

 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, None, None, None, None, None, None, None, None, None, None, None, None,
 None, None, 10,   None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, None, None, None, None, None, None, None, None, None, 
 None, None, None, None, None, 5

Lolo GHZ · Accepted Answer · 2021-11-18 22:42:09Z

0

class ConjuntoDeInteiros:
    def _init_(self, conjunto, storage_capacity=100): #initializes a list and its length, default value is 100
        self.storage_capacity = storage_capacity
        self.conjunto = [None] * storage_capacity

Your code needs to define conjunto in self.conjunto. Otherwise it won't recognize conjunto.

answered Nov 18, 2021 at 22:42

Lolo GHZ

11

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