Am 03.12.2012 20:58, schrieb subhabangal...@gmail.com: > Dear Group, > > I have a tuple of list as, > > tup_list=[(1,2), (3,4)] > Now if I want to covert as a simple list, > > list=[1,2,3,4] > > how may I do that?
Another approach that has not yet been mentioned here: >>> a=[(1,2), (3,4)] >>> b=[] >>> map(b.extend, a) [None, None] >>> b [1, 2, 3, 4] map returns [None, None] because extend returns nothing, but now b==[1,2,3,4]. There are more ways: >>> from operator import add >>> reduce(add, a) (1, 2, 3, 4) or >>> reduce(operator.add, (list(t) for t in a)) [1, 2, 3, 4] I didn't do any performance testing, i guess the first one should be about as fast es the for-loop approach with .extend() and the other two might be quite slow. Although this only really matters if you have large lists. Greetings -- http://mail.python.org/mailman/listinfo/python-list