我要评论当然，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 time
def 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 ... ^c keyboardinterrupt ... 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 time
def 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 <module>
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 sys
import time
def 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_hook
def 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 ... ^c keyboardinterrupt ... do something after interrupt ...
由于 suppress_keyboard_interrupt_message 函数中的 new_hook 是自定义的，所以你也不一定局限于只处理某种异常，甚至对所有异常做统一处理也是可以的。
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