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1. for loop else

   write:

   for x in data:
       if meets_condition(x):
           break
   else:
       # raise error or do additional processing 
   

   instead of:

   condition_is_met = False
   for x in data:
       if meets_condition(x):
           condition_is_met = True
   
   if not condition_is_met:
       # raise error or do additional processing
   

   http://shahriar.svbtle.com/pythons-else-clause-in-loops