the logical operation confused me

Gary Herron gary.herron at islandtraining.com
Thu Apr 10 19:13:49 EDT 2014


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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