On 12/05/2011 20:14, Andrew Berg wrote:
On 2011.05.11 01:05 PM, Roy Smith wrote:
You want to raise specific errors. Let's say you've got a function like
this:
def airspeed(swallow):
speeds = {"european": 42,
"african", 196}
return speeds[swallow]
If somebody passes an invalid string, it will raise KeyError as written.
Better to do something like:
def airspeed(swallow):
speeds = {"european": 42,
"african", 196}
try:
return speeds[swallow]
except KeyError:
raise UnknownBirdError(swallow)
Is there any way to do this without purposely setting up the code to
trigger an arbitrary exception if the function can't do its job? That
is, can I raise an UnknownBirdError outside of an except clause, and if
so, how? I can't find much help for doing this in Python 3, even in the
official docs.
>
You can raise an exception wherever you like! :-)
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