[Tutor] the and command

[max baseman]

thanks much you really helped me if anyone wants here is the program:

n2=2
n3=3
n4=4
n5=5
n6=6
n7=7
l2=[]
l3=[]
l4=[]
l5=[]
l6=[]
l7=[]
while n2 < 1000:
     l2.append(n2)
     n2=n2+2
while n3 < 1000:
     l3.append(n3)
     n3=n3+3
while n4 < 1000:
     l4.append(n4)
     n4=n4+4
while n5 < 1000:
     l5.append(n5)
     n5=n5+5
while n6 < 1000:
     l6.append(n6)
     n6=n6+6
while n7<1000:
     l7.append(n7)
     n7=n7+7
possible=[]
for num in l2:
     if num in l3 and num in l4 and num in l5 and num in l6:
         possible.append(num)
for a in possible:
     if a+1 in l7:
         print a+1



On Aug 24, 2007, at 1:25 AM, Alan Gauld wrote:

>
> "max baseman" <dos.fool at gmail.com> wrote
>> im checking if a number is in all 5 of the other lists and when
>> i use the and command it seems to just be checking if it's in a
>> least
>> one of the others,
>
>
>> for num in l2 and l3 and l4 and l5 and l6: # here seems to be the
>
> Try:
>
> if num in I2 and num in I3 and num in I4 and num in I5 and num in I6:
>
> In your case you are 'and'ing the lists which is a boolean expression
> and because of how Python does short circuit evaluation it returns
> the last list
>
>>>> a = [1,2]
>>>> b = [3,4]
>>>> a and b
> [3, 4]
>
> so
>
> for n in a and b:
>
> is the same as
>
> for n in b:
>
> which iterates over b...
>
> HTH,
>
> -- 
> Alan Gauld
> Author of the Learn to Program web site
> http://www.freenetpages.co.uk/hp/alan.gauld
>
>
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor