Ric Deez wrote: > Hi there, > > I have a list: > L1 = [1,1,1,2,2,3] > > How can I easily turn this into a list of tuples where the first element > is the list element and the second is the number of times it occurs in > the list (I think that this is referred to as a histogram): > > i.e.: > > L2 = [(1,3),(2,2),(3,1)]
>>> import itertools >>> L1 = [1,1,1,2,2,3] >>> L2 = [(key, len(list(group))) for key, group in itertools.groupby(L1)] >>> L2 [(1, 3), (2, 2), (3, 1)] -- Michael Hoffman -- http://mail.python.org/mailman/listinfo/python-list
