Martin von Zweigbergk <martinvonz@google.com> [Fri, 12 Jul 2019 23:24:04 -0700] rev 4742
py3: switch from iteritems() to items() in the topics extension
The only remaining iteritems() call is on branchmap. That will be
dealt with in the next patch.
Martin von Zweigbergk <martinvonz@google.com> [Sun, 14 Jul 2019 22:34:36 -0700] rev 4741
py3: filter() now returns a generator, so wrap when we need a list
Martin von Zweigbergk <martinvonz@google.com> [Fri, 12 Jul 2019 23:19:50 -0700] rev 4740
py3: don't depend on map() iterating over its input
map(some_generator()) in py2 returns a list, while in py3 it returns a
generator, so the passed-in generator won't be called unless the
returned one is.
Martin von Zweigbergk <martinvonz@google.com> [Thu, 11 Jul 2019 16:49:01 -0700] rev 4739
py3: implement __bool__ in addition to __nonzero__