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the logical operation confused me

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Date Fri, 11 Apr 2014 07:02:33 +0800
Subject the logical operation confused me
From length power <elearn2014@gmail.com>
To python-list@python.org
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>>> "ok" or "not ok"
'ok'
>>> "ok" and "not ok"
'not ok'
>>>

why "ok" or "not ok" output "ok"  , "ok" and "not ok"  output "not ok" ?

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the logical operation confused me length power <elearn2014@gmail.com> - 2014-04-11 07:02 +0800
  Re: the logical operation confused me Denis McMahon <denismfmcmahon@gmail.com> - 2014-04-10 23:28 +0000

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