[issue13252] new decumulate() function in itertools module
Raymond Hettinger added the comment: I also agree that the itertools module doesn't need this. (Reasons of symmetry are insufficient to make the module fatter that it already is). In addition, there are already a number of simple ways to do this. -- resolution: - rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13252 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13252] new decumulate() function in itertools module
Ezio Melotti ezio.melo...@gmail.com added the comment: I don't think this should go in itertools. It could go in the recipes at the bottom of the itertools doc, if you can provide some valid use cases (and possibly a patch too). -- nosy: +ezio.melotti stage: - needs patch versions: +Python 3.4 -Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13252 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13252] new decumulate() function in itertools module
Changes by Raymond Hettinger raymond.hettin...@gmail.com: -- assignee: - rhettinger priority: normal - low ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13252 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13252] new decumulate() function in itertools module
Changes by Petri Lehtinen pe...@digip.org: -- nosy: +petri.lehtinen ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13252 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13252] new decumulate() function in itertools module
Nick Coghlan ncogh...@gmail.com added the comment: OK, looking at the code I realised what you're trying to get at is the idea of reporting the differences between values in a series, such that: x = list(accumulate(seq)) assert x == list(accumulate(differences(x))) I don't think the use cases are there to justify the addition (not every iterator we can think of should be a building block in itertools), but if such a thing were to be added, differences would convey the intention significantly better than the invented term decumulate. -- nosy: +ncoghlan ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13252 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue13252] new decumulate() function in itertools module
New submission from Carlo Verre carlo.ve...@gmail.com: After in Python 3.2 the accumulate() function has been added to itertools module, for self-evident reasons of completeness and symmetry we could add in 3.3 the inverse decumulate() function, which, given the iterable argument p, yields p[0], p[1] - p[0], p[2] - p[1]... Its equivalent python form is in the attached file decumulate.py, below. -- components: Extension Modules files: decumulate.py messages: 146263 nosy: carlo.verre, rhettinger priority: normal severity: normal status: open title: new decumulate() function in itertools module type: feature request versions: Python 3.3 Added file: http://bugs.python.org/file23507/decumulate.py ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue13252 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
