Adding graph points and formating

[project_science]

Hi,

I'm creating a code to input 2 points, (x,y) from the user. I've done that, and now I'd like to add these. However, I want to display the points which were input first. I know there's a problem in these lines:

    def get_nums(self):
        return "{[0],[1]}".format(self.x1, self.y1)

What I'd like to do is something like this, but it won't work:

    def get_nums(self):
        return "point 1 = ", "{[0],[1]}".format(self.x1, self.y1)

Here's my full code:

class Input_Points:

    # constructor, arguement receives 4 instance attributes
    def __init__(self,x1, y1, x2, y2):
        self.x1 = x1
        self.y1 = y1
        self.x2 = x2
        self.y2 = y2

    """Get integers from user"""
    def set_nums(self):
        self.x1 = int(input('enter x1: '))
        self.y1 = int(input('enter y1: '))
        self.x2 = int(input('enter x2: '))
        self.y2 = int(input('enter y2: '))

    def get_nums(self):
        return "{[0],[1]}".format(self.x1, self.y1)

# Class: Input_Points
w1 = Input_Points("","","","") # no default parameters
w1.set_nums()
w1.get_nums()

When I run the code, it takes the points, but then returns this error:

return "{[0],[1]}".format(self.x1, self.y1)
TypeError: 'int' object is not subscriptable

Any ideas where I'm going wrong?