Example Point class

"""Challenge Question Class."""
from __future__ import annotations


class Point:
    """Class to represent (x,y) coordinate point."""
    
    x: float
    y: float
    
    def __init__(self, init_x: float, init_y: float):
        """Construct a point."""
        self.x = init_x
        self.y = init_y
    
    def scale_by(self, factor: int) -> None:
        """Modify (or mutate) a point."""
        self.x *= factor
        self.y *= factor
        
    def scale(self, factor: int) -> Point:
        """Make a new point."""
        return Point(self.x * factor, self.y * factor)