python Programming Glossary: list_2

How to sort nested lists into seperate lists with unique values in python?

http://stackoverflow.com/questions/16862090/how-to-sort-nested-lists-into-seperate-lists-with-unique-values-in-python

output would be something like this list_1 'name1' 'name2' list_2 'name4' 'name5' list_3 'name3' name6' python sorting nested.. #now access those lists dic 'list_1' 'name1' 'name2' dic 'list_2' 'name4' 'name5' dic 'list_3' 'name3' 'name6' In case you had..

list comprehension filtering - “the set() trap”

http://stackoverflow.com/questions/20056458/list-comprehension-filtering-the-set-trap

. People quickly find that this x for x in list_1 if x in list_2 is slow for large inputs it's O n m . Yuck. How do we speed.. this up Use a set to make filtering lookups O 1 s set list_2 x for x in list_1 if x in s This gives nice overall O n behavior... coders fall into The Trap x for x in list_1 if x in set list_2 Ack This is again O n m since python builds set list_2 every..