[Python-checkins] Add comment and improve variable name in roundrobin() (GH-4486) (#4487)
Raymond Hettinger
webhook-mailer at python.org
Tue Nov 21 03:29:36 EST 2017
https://github.com/python/cpython/commit/32b003aca3e9d670367bd62cbf355ee61fa6b308
commit: 32b003aca3e9d670367bd62cbf355ee61fa6b308
branch: 3.6
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: Raymond Hettinger <rhettinger at users.noreply.github.com>
date: 2017-11-21T00:29:34-08:00
summary:
Add comment and improve variable name in roundrobin() (GH-4486) (#4487)
(cherry picked from commit 337cbbace0a43f50fcd33ea4d3b7cb30733237db)
files:
M Doc/library/itertools.rst
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 86a590bb67c..594af39f60f 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -753,15 +753,16 @@ which incur interpreter overhead.
def roundrobin(*iterables):
"roundrobin('ABC', 'D', 'EF') --> A D E B F C"
# Recipe credited to George Sakkis
- pending = len(iterables)
+ num_active = len(iterables)
nexts = cycle(iter(it).__next__ for it in iterables)
- while pending:
+ while num_active:
try:
for next in nexts:
yield next()
except StopIteration:
- pending -= 1
- nexts = cycle(islice(nexts, pending))
+ # Remove the iterator we just exhausted from the cycle.
+ num_active -= 1
+ nexts = cycle(islice(nexts, num_active))
def partition(pred, iterable):
'Use a predicate to partition entries into false entries and true entries'
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