How to return a standard output instead of string

[kavindu]

I'm writing a code for return the formula of a circle by giving the coordinates of the O and the radius
this is a part of my code

class circle:
    
    def __init__(self,o_x,o_y,r):
        if(r<0):
            raise ArithmeticError("Radious can't be smaller than 0")
        self.o_x=float(o_x)
        self.o_y=float(o_y)
        self.r=float(r)
        self.co_x=-2*self.o_x
        self.co_y=-2*self.o_y
        self.c=(self.o_x)**2+(self.o_y)**2-self.r**2

    def func(self):
        concat_x="+"
        concat_y="+"
        concat_c="+"
        if(self.co_x<0):
            concat_x=""
        if(self.co_y<0):
            concat_y=""
        if(self.c<0):
            concat_c=""
        func="x**2 " + concat_x + str(self.co_x) + "x " + "+y**2 " + concat_y + str(self.co_y) + "y " + concat_c + str(self.c)+" = 0"
        return func

the func()return the formula of the circle.But it return output as a String with (' ')quotes just like

Output:
'x**2 + 4x + y**2 +6y -15'

But I need to return a Standard Output without (' ') just like

Output:
x**2 + 4x + y**2 +6y -15

[ichabod801]

What to mean by "standard output"? In Python, the standard output (sys.stdout) is a file stream that (normally) displays text to the user. That's where the print function sends things. If you print the string, you won't see the quotes. Is that all you want?