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当然，像下面这种情况。

你要是把所有代码像下面那样都放到 try, except 的情况，就当我什么也没说。

import timedef main():    print('before ...')    time.sleep(10)    print('after ...')if __name__ == '__main__':    try:        main()    except KeyboardInterrupt:        print('\nKeyboardInterrupt ...')    print('the end')

root@master ~/w/python3_learning# python3 test.py before ...^CKeyboardInterrupt ...the end

一般情况下，程序运行过程当中要执行的代码量会比较大，一般用户执行 Ctrl + C 程序就报错 KeyboardInterrupt 停止了。

import timedef main():    print('before ...')    time.sleep(10)    print('after ...')if __name__ == '__main__':    main()    print('the end')

root@master ~/w/python3_learning# python3 test.py before ...^CTraceback (most recent call last):  File "test.py", line 11, in 
   
        main()  File "test.py", line 6, in main    time.sleep(10)KeyboardInterrupt
   

但是有时候，我们希望用户在 Ctrl + C 之后再继续执行一些清理操作。

import sysimport timedef suppress_keyboard_interrupt_message():    old_excepthook = sys.excepthook    def new_hook(exctype, value, traceback):        if exctype != KeyboardInterrupt:            old_excepthook(exctype, value, traceback)        else:            print('\nKeyboardInterrupt ...')            print('do something after Interrupt ...')    sys.excepthook = new_hookdef main():    print('before ...')    time.sleep(10)    print('after ...')if __name__ == '__main__':    suppress_keyboard_interrupt_message()    main()    print('the end')

root@master ~/w/python3_learning# python3 test.py before ...^CKeyboardInterrupt ...do something after Interrupt ...

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