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tkinter关闭窗口后程序并未退出：检查这时共有7个线程。

threading.active_count()7threading.current_thread()<_MainThread(MainThread, started 140695305631552)>threading.enumerate()[<_MainThread(MainThr...05631552)>, 
   
    , 
    
     , <_TimeoutThread(Thre...58498816)>, 
     
      , 
      
       , 
       
        ]special variables:function variables:0: <_MainThread(MainThread, started 140695305631552)>1: 
        
         2: 
         
          3: <_TimeoutThread(Thread-4, started daemon 140695258498816)>4: 
          
           5: 
           
            6: 
            
             special variables:function variables:additional_info: <_pydevd_bundle.pydevd_cython.PyDBAdditionalThreadInfo object at 0x7ff590656580>daemon: Falseident: 140692661450496name: 'Thread-7'native_id: 6254stop_reason: 105_args: ()_bootstrap: 
             
              >_bootstrap_inner: 
              
               >_daemonic: False_delete: 
               
                >_ident: 140692661450496_initialized: True_invoke_excepthook: 
                
                 .invoke_excepthook at 0x7ff590404a60>_is_stopped: False_kwargs: { }_name: 'Thread-7'_native_id: 6254_reset_internal_locks: 
                 
                  >_set_ident: 
                  
                   >_set_native_id: 
                   
                    >_set_tstate_lock: 
                    
                     >_started: 
                     
                      _stderr: <_io.TextIOWrapper name='
                      
                       ' mode='w' encoding='utf-8'>_stop: 
                       
                        >_target: 
                        
                         >_tstate_lock: 
                         
                          _wait_for_tstate_lock: 
                          
                           >len(): 7
                          
                         
                        
                       
                      
                     
                    
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     
    
   

在tkinter退出窗口后，走完最后一条程序代码，发现终端并没有退出，仍在运行，这时在vs code的调试模式下点暂停，

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