[Edu-sig] Truth values and comparisons

[Arthur]

John Zelle wrote:

>On Monday 30 October 2006 10:49 am, Arthur wrote:
>  
>
>>
>>thanks, but having some trouble:
>> >>> import Numeric as N
>> >>> a=N.array([0,0,0])
>> >>> b=N.array([0,0,1])
>> >>> a and b
>>
>>array([0, 0, 0])
>>    
>>
>
>This tells me that a zero array is being treated as False (the logical 
>extension to arrays of 0 being false. 
>  
>
>> >>> b and  a
>>
>>array([0, 0, 0])
>>    
>>
> 
>Right. In both cases, the answer is False, which Python gives to you by 
>handing you the first False expression. 
>
Ah. that is what I was missing, returns the first *False* expression.  I 
was interpreting Dave
to say that it returns the first expression, period.

With that, things fall into place.

Thanks,

Art