Python：except和except Exception as e:的区别

参考：Stack Overflow

1. 后者可以访问异常对象的属性。

   >>> def catch():
   ...     try:
   ...         asd()
   ...     except Exception as e:
   ...         print e.message, e.args
   ... 
   >>> catch()
   global name 'asd' is not defined ("global name 'asd' is not defined",)
   

2. 前者接受所有异常，而后者只接受你【想要】捕获的异常。例如，前者接受了KeyboardInterrupt而后者没有：

   >>> try:
   ...     input()
   ... except:
   ...     pass
   ... 
   >>> try:
   ...     input()
   ... except Exception as e:
   ...     pass
   ... 
   Traceback (most recent call last):
     File "", line 2, in 
   KeyboardInterrupt
   

   下面是一个简短的列表：

   issubclass(BaseException, BaseException)
   #>>> True
   issubclass(BaseException, Exception)
   #>>> False
   
   
   issubclass(KeyboardInterrupt, BaseException)
   #>>> True
   issubclass(KeyboardInterrupt, Exception)
   #>>> False
   
   
   issubclass(SystemExit, BaseException)
   #>>> True
   issubclass(SystemExit, Exception)
   #>>> False
   

   如果你想捕捉到其中任何一个，最好这样：

   except BaseException:
   

   来指出你知道自己在做什么。