human
Solve the following python programming problem given the following code:
def _resize(self, dialog_w, dialog_h, repaint = 1) : 
    'Attempt to resize the controls on the dialog, spreading
        then horizontally to cover the full extent of the dialog
        box, with left-aligned labels and right-aligned buttons.
        ' 
    def coords(hwnd, id) : 
        ctrl = wrapped (win32gui.GetDlgItem, hwnd, id) 
        (l, t, r, b) = wrapped (win32gui.GetWindowRect, ctrl) 
        (l, t) = wrapped (win32gui.ScreenToClient, hwnd, (l, t)) 
        (r, b) = wrapped (win32gui.ScreenToClient, hwnd, (r, b)) 
        return (ctrl, l, t, r, b) 
hDC = wrapped (win32gui.GetDC, self.hwnd) 
    try : 
        (label_w, label_h) = max ((wrapped (win32gui.GetTextExtentPoint32, hDC, (label or '')) for (label, _, _) in self.fields)) 
finally : 
        wrapped (win32gui.ReleaseDC, self.hwnd, hDC) 
for (i, (field, default, callback)) in enumerate (self.fields) : 
        if (field is not None) : 
            (label, l, t, r, b) = coords (self.hwnd, (self.IDC_LABEL_BASE + i)) 
            wrapped (win32gui.MoveWindow, label, self.GUTTER_W, t, label_w, (b - t), repaint) 
            label_r = (self.GUTTER_W + label_w) 
            if callback : 
                (callback_button, l, t, r, b) = coords (self.hwnd, (self.IDC_CALLBACK_BASE + i)) 
                callback_w = (callback - l) 
                callback_l = ((dialog_w - self.GUTTER_W) - callback_w) 
                MoveWindow (callback_button, callback_l, t, (r - l), (b - t), repaint) 
else : 
                callback_w = 0 
else : 
            label_r = callback_w = 0 
(field, l, t, r, b) = coords (self.hwnd, (self.IDC_FIELD_BASE + i)) 
        field_l = (label_r + self.GUTTER_W) 
        field_w = (((dialog_w - self.GUTTER_W) - field_l) - ((callback_w + self.GUTTER_W) if callback_w else 0)) 
        MoveWindow (field, field_l, t, field_w, (b - t), repaint) 
if self._progress_id : 
        (field, l, t, r, b) = coords (self.hwnd, self._progress_id) 
        field_w = (dialog_w - (2 * self.GUTTER_W)) 
        MoveWindow (field, l, t, field_w,...

    
    

    Fix the buggy line: callback_w = (callback - l)
assistant
#Here is Python code to fix the buggy line: callback_w = (callback - l)
.

callback_w = (r - l)