How to add different vectors in vector class? Python

This is one of my first python programs.
I cannot operate on vectors created from init with fill_n. I don’t know what I should change.

additionally
"The inner representation of the vector should not be visible outside the class (protected field)."

class Vector:
    def __init__ (self, lista):
        self.value = lista

    def __add__ (self, other):

        res = Vector( [x + y for x, y in zip(self.value, other.value) ])
        return res

    def __mul__(self, other):
        dot=0
        for x, y in zip(self.value, other.value):
             dot = dot + x *y
        return dot

    def fill_n ( size, val):
        value=[val]*size
        return tuple(value)

    def __str__(self):
        return ', '.join([str(x) for x in self.value])


def main():
    v1 = Vector([1, 2, 3])
    v2 = Vector([4, 2, 2])
    v3 = Vector.fill_n(3,1)

    print (v1 + v2)
    print (v1 + v3) #It doesn't work 
    print(v3)


main()

The error I get is:

Traceback (most recent call last):
  line 34, in <module>
    main()
  line 30, in main
    print (v1 + v3) #It doesn't work
  line 7, in __add__
    res = Vector( [x + y for x, y in zip(self.value, other.value) ])
AttributeError: 'tuple' object has no attribute 'value'

>Solution :

Technically you only need one change to get this to work; v3 is a tuple of 3 values. You can just pass it to the constructor of Vector and the result will be a proper Vector object that you can add to other vectors, like so:

v3 = Vector(Vector.fill_n(3,1))

Like I said in a comment, the fill_n method doesn’t reference the self parameter, so you should put @staticmethod above it. It’s not necessary in this case but it’ll throw off any kinds of static analyzers or linters that IDEs use:

@staticmethod
    def fill_n(size, val):
        ...

With that taken care of, your script runs fine. Output:

5, 4, 5
2, 3, 4
1, 1, 1