Grid

width = 15
length = 10;

class point:
    def __init__ (self, xin, yin, dispin = '!'):
        self.xpos, self.ypos = xin, yin
        self.disp = dispin

    def set_pos (self, x, y):
        self.xpos, self.ypos = x, y

class Data:
    def __init__ (self):
        self.points = []

    def search_coord (self, x, y):
        for check in self.points:
            if check.xpos == x and check.ypos == y:
                return check.disp
        return ' '

    def display (self):
        for yd in range (length):
            for xd in range (width):
                occ = self.search_coord (xd, yd)
                print ("{:>3}".format (occ), end = '')
            print ('\n')

    def add_point (self, x, y, d = '?'):
        tpoint = point (x, y, d)
        self.points.append (tpoint)

data = Data ()

data.add_point (0, 0, '$')
data.add_point (5, 5, '+')
data.add_point (9, 9, '()')

data.display ()