Best way to generate alternate toggling values in a loop?

[Brian Blais]

On Oct 18, 2007, at Oct 18:7:47 AM, Paul Hankin wrote:

> On Oct 18, 12:11 pm, "Amit Khemka" <khemkaa... at gmail.com> wrote:
>> Why not just use enumerate ?
>>
>> clvalues = ["Even", "Odd"]
>> for i, (id, name) in enumerate(result):
>>     stringBuffer.write('''
>>     <tr class="%s">
>>            <td>%d</td>
>>            <td>%s</td>
>>      </tr>
>>      '''
>>     %
>>     (clvalues[i % 2], id, name))
>
> I like this code: straightforward and pragmatic.

Although the itertools is probably the way to go here, I've used the  
following construct, especially in two-player games.  I like the  
readability of it:

value='Even'
other_value='Odd'
for i, (id,name) in enumerate(result):
     stringBuffer.write('''
     <tr class="%s">
         <td>%d</td>
         <td>%s</td>
     </tr>
     ''' % (value,id,name)


     value,other_value=other_value,value   # swap the value





			bb

-- 
Brian Blais
bblais at bryant.edu
http://web.bryant.edu/~bblais



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