python remove duplicates from 2 lists -

i trying remove duplicates 2 lists. wrote function:

a = ["abc", "def", "ijk", "lmn", "opq", "rst", "xyz"]  b = ["ijk", "lmn", "opq", "rst", "123", "456", ]  in b:     if in a:         print "found " +         b.remove(i)  print b 

but find matching items following matched item not remove.

i result this:

found ijk found opq ['lmn', 'rst', '123', '456'] 

but expect result this:

['123', '456']

how can fix function want?

thank you.

here what's going on. suppose have list:

['a', 'b', 'c', 'd'] 

and looping on every element in list. suppose @ index position 1:

['a', 'b', 'c', 'd']        ^        |    index = 1 

...and remove element @ index position 1, giving this:

['a',      'c', 'd']        ^        |     index 1 

after removing item, other items slide left, giving this:

['a', 'c', 'd']        ^        |     index 1 

then when loop runs again, loop increments index 2, giving this:

['a', 'c', 'd']             ^              |          index = 2 

see how skipped on 'c'? lesson is: never delete element list looping over.