Everything works except for one line of code

[ThomasL]

You need to look a little bit more into python oop

class SumTheIntegers:
    def __init__(self, x, y):
        self.x = x
        self.y = y
 
    def _sum(self):
        return self.x + self.y
     
def main():
    sum_integers = SumTheIntegers(10, 13)
     
    print("The value of x is", sum_integers.x)
    print("The value of y is", sum_integers.y)
    print()
    print("The sum is", sum_integers._sum())
     
main()