Select unique value in many lists in python -

i'd select unique value in many lists, don't know how that:

a = [1,2,3,4,5] b = [2,3,4,5,6]  c = [5,6,7,8,9]

i'd make 1 new list [1,2,3,4,5,6,7,8,9]

i know using following done, searching quicker way that.

for in (a, b, c):     j in eachvalueineachlist:         newlist.append(j) list(set(newlist)

by way, there thousand of lists in real program.

thank much.

>>> = [1,2,3,4,5] >>> b = [2,3,4,5,6] >>> c = [5,6,7,8,9] >>> list(set(a + b + c)) [1, 2, 3, 4, 5, 6, 7, 8, 9]

to avoid creating temporary list, use itertools.chain:

>>> import itertools >>> list(set(itertools.chain(a, b, c))) [1, 2, 3, 4, 5, 6, 7, 8, 9]

update (answer comment)

list(set(itertools.chain.from_iterable(a_list_of_lists)))

KBPS