map(lambda i: -i if i&1==1 else i, xrange(2, 10))
On Sun, Jan 4, 2015 at 10:34 PM, flebber <flebber.c...@gmail.com> wrote: > In repsonse to this question: Write a program that prints the first 100 > members of the sequence 2, -3, 4, -5, 6, -7, 8. > > This is my solution it works but ugly. > > series = range(2,100) > # answer = [(x,(y* -1)) for x, y in series[::2]] > # print(answer) > answer = [] > for item in series: > if item % 2 != 0: > answer.append(item * -1) > else: > answer.append(item) > > print(answer) > > I know I should be better off doing this with map but cannot get it to work. > I understand also that map returns a generator so this solution should only > working in python2(correct me please if I am wrong). > > In [6]: map? > Type: builtin_function_or_method > String Form:<built-in function map> > Namespace: Python builtin > Docstring: > map(function, sequence[, sequence, ...]) -> list > > Just getting something wrong > list(map((lambda x: x * -1 if (x%2 != 0)), series)) > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
