strange use of %s

Tracubik affdfsdfdsfsd at
Mon Apr 18 04:29:14 EDT 2011

Hi all,
i'm reading a python tutorial in Ubuntu's Full Circle Magazine and i've 
found this strange use of %s:

sql = "SELECT pkid,name,source,servings FROM Recipes WHERE name like '%%%s%
%'" %response

response is a string. I've newbie in sql.

why do the coder use %%%s%% instead of a simple %s?
why he also use the ''?

thanks in advance for you attention/replies


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