Is there any difference between
except:
and except Exception: ?
Can except deal with anything that is not an exception?
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No, they are functionally identical :-)Dan Lecocq– Dan Lecocq2013-05-09 16:20:52 +00:00Commented May 9, 2013 at 16:20
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Actually, I take that back -- they are differentDan Lecocq– Dan Lecocq2013-05-09 16:22:05 +00:00Commented May 9, 2013 at 16:22
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2 Answers
As of Python 2.5, there is a new BaseException which serve as base class for Exception. As result, something like GeneratorExit that inherents directly from BaseException would be caught by except: but not by except Exception:.
3 Comments
kindall
+1 for mentioning
BaseException. One important thing that except: catches that except Exception: does not is KeyboardInterrupt. Liberal use of bare except: may make it hard to stop your scripts!
marcoseu
That is correct. KeyboardInterrupt also inherits from BaseException.
Jonathan Hartley
SystemExit also inherits from BaseExcrption
This is from the doc
If an exception occurs which does not match the exception named in the except clause, it is passed on to outer try statements; if no handler is found, it is an unhandled exception and execution stops with a message as shown above.
You can even be more specific.
>>> while True:
... try:
... x = int(raw_input("Please enter a number: "))
... break
... except ValueError:
... print "Oops! That was no valid number. Try again..."
Here, you enter except clause only if you are facing the named error, ValueError
