Eval of expr with 'or' and 'and' within

[Nick the Gr33k]

On 14/6/2013 5:49 μμ, Grant Edwards wrote:
> On 2013-06-14, Nick the Gr33k <support at superhost.gr> wrote:
>
>> I started another thread
>
> no kidding.
>
>> because the last one was !@#$'ed up by irrelevant replies and was
>> difficult to jeep track.
>>
>>>>> name="abcd"
>>>>> month="efgh"
>>>>> year="ijkl"
>>
>>>>> print(name or month or year)
>> abcd
>>
>> Can understand that, it takes the first string out of the 3 strings
>> that has a truthy value.
>
> Yes, it does.  That's the way the language is defined to work.  If you
> don't like it, pick a different language.

I can understand OR stops at the first value when it finds it truthy, 
and doesn't care for the other expr parameters.

And that logical since we say:

(name or month or year)
is like saying:

print whatever of those 3 are True, at least 1 of them, if it doesn't 
not find any though for some reason it defaults to the last variable of 
the expression(another mystery for me)

the way i realize it is just that for this boolean evaluation of the 
expression to result in True if any of the above vars holds a truthy value.


Nice try, moving me to another newsgroup list :)

>>>>> print("k" in (name and month and year))
>> True
>>
>> No clue. since the expression in parenthesis returns 'abcd'
>
> No it doesn't.  Try it:
>
> Python 2.7.3 (default, Mar 20 2013, 14:16:24)
> [GCC 4.6.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>>>> name="abcd"
>>>> month="efgh"
>>>> year="ijkl"
>>>>
>>>> "k" in (name and month and year)
> True
>>>> (name and month and year)
> 'ijkl'
>>>>
>
>> how can 'k' contained within 'abcd' ?
Um sorry was a  typo.

I mean the expr eval results in the value of var year which is 'ijkl'.

 >>>> "k" in (name and month and year)
 > True

So yes it does.

My question is why the expr (name and month and year) result in the 
value of the last variable whic is variable year?

I cannot understand AND.

Isn't it like saying that:
(name and month and year)

all of these variables have to have truthy values so for the boolaean 
eval of the expr result in True?

-- 
What is now proved was at first only imagined!