the logical operation confused me

[Gary Herron]

On 04/10/2014 04:02 PM, length power wrote:
> >>> "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" ?
>
>
>

You are probably confusing yourself with the string "not ok".  That 
string, and any other non-empty string is considered true
 >>> bool("not ok")
True
 >>> bool("ok")
True

perhaps you meant
 >>> not "ok"
False



Once past that possible confusion, the return value of the *and* and 
*or* operators are explained here:
     https://docs.python.org/release/2.5.2/lib/boolean.html

Gary Herron
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