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Groups > comp.lang.python > #5251

Re: Proper way to handle errors in a module

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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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Thread

Proper way to handle errors in a module Andrew Berg <bahamutzero8825@gmail.com> - 2011-05-11 12:29 -0500
  Re: Proper way to handle errors in a module Roy Smith <roy@panix.com> - 2011-05-11 14:05 -0400
    Re: Proper way to handle errors in a module Andrew Berg <bahamutzero8825@gmail.com> - 2011-05-12 14:14 -0500
    Re: Proper way to handle errors in a module MRAB <python@mrabarnett.plus.com> - 2011-05-12 20:25 +0100
    Re: Proper way to handle errors in a module Andrew Berg <bahamutzero8825@gmail.com> - 2011-05-12 15:12 -0500
    Re: Proper way to handle errors in a module Corey Richardson <kb1pkl@aim.com> - 2011-05-12 16:20 -0400
    Re: Proper way to handle errors in a module Tycho Andersen <tycho@tycho.ws> - 2011-05-12 15:26 -0500
      Re: Proper way to handle errors in a module Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-13 00:43 +0000
    Re: Proper way to handle errors in a module MRAB <python@mrabarnett.plus.com> - 2011-05-12 21:26 +0100
    Re: Proper way to handle errors in a module Ethan Furman <ethan@stoneleaf.us> - 2011-05-12 13:40 -0700
    Re: Proper way to handle errors in a module Andrew Berg <bahamutzero8825@gmail.com> - 2011-05-12 15:35 -0500
      Re: Proper way to handle errors in a module Ben Finney <ben+python@benfinney.id.au> - 2011-05-13 10:56 +1000

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