On Tuesday, 24 March 2015 21:04:37 UTC-7, Paul Rubin wrote: > nobody writes: > > I have a list containing 9600 integer elements - each integer is > > either 0 or 1. > > Is that a homework problem? This works for me in Python 2.7 but I think > Python 3 gratuitously broke tuple unpacking so it won't work there: > > ================================================================ > > from itertools import count, groupby > old = [0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1] > new = [reduce(lambda x,(y,i):x*2+y, g, 0) > for k,g in groupby(zip(old,count()), lambda (a,b): b//8)] > print new > > >>> [18, 222, 53] > ================================================================
no homework - real life. thanks for your contribution -- https://mail.python.org/mailman/listinfo/python-list
