Is this a correct way to generate an exception when getting a wrong parameter

From	Cecil Westerhof <Cecil@decebal.nl>
Newsgroups	comp.lang.python
Subject	Is this a correct way to generate an exception when getting a wrong parameter
Date	2015-08-12 11:06 +0200
Organization	Decebal Computing
Message-ID	<87h9o46flw.fsf@Equus.decebal.nl> (permalink)

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I have:
========================================================================
accepted_params     = {
    'pcpu',
    'rss',
    'size',
    'time',
    'vsize',
}
========================================================================

Later I use:
========================================================================
if (to_check != 'all') and not(to_check in accepted_params):
    raise Exception('Used illegal parameter: {0}.\n'
                    'Accepted ones: {1}'
                    .format(to_check, sorted(accepted_params)))
========================================================================

When using 'all' I want to do the work for all accepted parameters.
;-)

Is this a correct way to do this, or is there a better way?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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Is this a correct way to generate an exception when getting a wrong parameter Cecil Westerhof <Cecil@decebal.nl> - 2015-08-12 11:06 +0200
  Re: Is this a correct way to generate an exception when getting a wrong parameter Chris Angelico <rosuav@gmail.com> - 2015-08-12 19:25 +1000
  Re: Is this a correct way to generate an exception when getting a wrong parameter Peter Otten <__peter__@web.de> - 2015-08-12 11:33 +0200
  Re: Is this a correct way to generate an exception when getting a wrong parameter Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-08-12 11:43 +0100
    Re: Is this a correct way to generate an exception when getting a wrong parameter Bernd Waterkamp <Bernd-Waterkamp@web.de> - 2015-08-12 18:42 +0200

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