human
Solve the following python programming problem given the following code:
def draw(self) : 
    if (self._root is None) : 
        return 
LEFT_MARGIN = BOT_MARGIN = 15 
    TOP_MARGIN = 5 
    c = self._canvas 
    c.delete ('all') 
    N = (self._chart.num_leaves () + 1) 
    dx = ((int (c ['width']) - LEFT_MARGIN) / N) 
    dy = (((int (c ['height']) - TOP_MARGIN) - BOT_MARGIN) / N) 
    c.delete ('all') 
    for i in range (N) : 
        c.create_text ((LEFT_MARGIN - 2), (((i * dy) + (dy / 2)) + TOP_MARGIN), text = repr (i), anchor = 'e') 
        c.create_text ((((i * dx) + (dx / 2)) + LEFT_MARGIN), (((N * dy) + TOP_MARGIN) + 1), text = repr (i), anchor = 'n') 
        c.create_line (LEFT_MARGIN, ((dy * (i + 1)) + TOP_MARGIN), ((dx * N) + LEFT_MARGIN), ((dy * (i + 1)) + TOP_MARGIN), dash = '.') 
        c.create_line (((dx * i) + LEFT_MARGIN), TOP_MARGIN, ((dx * i) + LEFT_MARGIN), ((dy * N) + TOP_MARGIN), dash = '.') 
c.create_rectangle (LEFT_MARGIN, TOP_MARGIN, (LEFT_MARGIN + (dx * N)), ((dy * N) + TOP_MARGIN), width = 2) 
    self._cells = [[None for i in range (N)] for j in range (N)] 
    for i in range (N) : 
        for j in range (i, N) : 
            t = c.create_rectangle (((j * dx) + LEFT_MARGIN), ((i * dy) + TOP_MARGIN), (((j + 1) * dx) + LEFT_MARGIN), (((i + 1) * dy) + TOP_MARGIN), fill = 'gray20') 
            self._cells [i] [j] = t 
            def cb(event, self = self, i = i, j = j) : 
                self._click_cell (i, j) 
c.tag_bind (t, '<Button-1>', cb) 
(xmax, ymax) = (int (xmax ['width']), int (c ['height'])) 
    t = c.create_rectangle ((- 100), (- 100), (xmax + 100), (ymax + 100), fill = 'gray50', state = 'hidden', tag = 'inactivebox') 
    c.tag_lower (t) 
    self.update () 

    
    

    Fix the buggy line: (xmax, ymax) = (int (xmax ['width']), int (c ['height']))
assistant
#Here is Python program to fix the buggy line: (xmax, ymax) = (int (xmax ['width']), int (c ['height']))
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(xmax, ymax) = (int (c ['width']), int (c ['height']))