def get_area_rect(length, width):
        """Returns area of rectangle
        >>> get_area_rect(5 , 5)
        25
        >>> get_area_rect(5 , 0)
        Traceback (most recent call last):
        ...
        ValueError
        >>> get_area_rect(5 , -1)
        Traceback (most recent call last):
        ...
        ValueError
        """
        
        if(length <=  0) or (width <= 0):
                raise ValueError
        return length * width