AttributeError: 'int' object has no attribute 'weight'

Question

I have two files in one folder, which are

"converters.py" is a module while "app.py" is a python file which tests it

here are the contents in the "converters.py module":

class KgLbs:
def __init__(self, weight):
    self.weight = weight

def lbs_to_kg(self):
    return self.weight * 0.45

def kg_to_lbs(self):
    return self.weight / 0.45

and here are the ones in the "app.py" script:

from converters import KgLbs as kglbs

weight = int(input("Weight: "))
weight = kglbs.kg_to_lbs(weight)
print(weight)

and that's the error it gives me when I input an integer:

Weight: 52
Traceback (most recent call last):
  File "app.py", line 4, in <module>
    weight = kglbs.kg_to_lbs(weight)
  File "C:\Users\Cyntexia\PycharmProject\Test\converters.py", line 8, in kg_to_lbs
    return self.weight / 0.45
AttributeError: 'int' object has no attribute 'weight'

all i wanna do is input a simple integer, and then it will be converted to weight i desire altho this error comes in my goddamn way

Answer 1

With the way you designed your class, you have to use it in this way:

weight = KgLbs(weight).kg_to_lbs()

To use your way, you need to define your methods as @classmethods and pass the weight as an argument to them (no need for __init__ here):

class KgLbs:
  @staticmethod
  def lbs_to_kg(weight):
      return weight * 0.45

  @staticmethod
  def kg_to_lbs(weight):
      return weight / 0.45

weight = int(input("Weight: "))
weight = KgLbs.kg_to_lbs(weight)
print(weight)

Answer 2

You haven't initialised the weight for the object. It should've been like

from converters import KgLbs as kglbs

weight = int(input("Weight: "))
obj = kglbs(weight)
print(obj.kg_to_lbs())

Answer 3

Python is a strongly-typed language, and you are assigning a value of type int to the weight variable. Why do you think this int value should behave like a KgLbs ?

use this instead:

from converters import KgLbs as kglbs

weight = kglbs(int(input("Weight: ")))
weight = weight.kg_to_lbs()
print(weight)