loops -> list/generator comprehensions

[Steven Bethard]

Caleb Hattingh wrote:
>> Would
>>
>>      filenames = [os.path.join(dirpath, filename)
>>                   for dirpath, dirnames, filenames in os.walk('.')
>>                   for filename in filenames]
>>
>> have been clearer for you?  Then all you have to do is remember the  
>> order of the for-loop execution:
> 
> Bizarre as this may sound, it was the '_' that was throwing me off the  
> whole thing (at the 'grok' level I generally read the newsgroup,  
> anyway).   For some weird reason, I can read *this* comprehension 
> pretty  easily!  Does that make sense at all?  I figure a little bit of  
> uncertainty along the way probably derails understanding of the whole  
> thing a little bit

Yup, actually, that's what I kinda suspected happened.  But if it 
happened for you, it probably happened for a dozen other folks who read 
the same thing, so I'm glad to hear rewriting it and explaining the '_' 
was helpful.

STeVe