human
Solve the following python programming problem given the following code:
def _on_timer_delete_another(self, holder) : 
    'A timeout handler that tries to remove another timeout handler
        that is ready to run. This should pose no issues.' 
    target_timer = _on_timer_conclude [0] 
    self.ioloop.remove_timeout (target_timer) 
    self.deleted_another_timer = True 
    def _on_timer_conclude() : 
        'A timeout handler that is called to verify outcome of calling
            or not calling of previously set handlers.' 
        self.concluded = True 
        self.assertTrue (self.deleted_another_timer) 
        self.assertNotIn (target_timer, self.ioloop._poller._timeouts) 
        self.ioloop.stop () 
self.ioloop.add_timeout (0.01, _on_timer_conclude) 

    
    

    Fix the buggy line: target_timer = _on_timer_conclude [0]
assistant
#Here is Python program to fix the buggy line: target_timer = _on_timer_conclude [0]
.

target_timer = holder [0]