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| author | Raymond Hettinger <python@rcn.com> | 2016-03-07 02:11:38 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2016-03-07 02:11:38 (GMT) |
| commit | e525ee3b483889313b62b09b4c9103d18dd9cbb7 (patch) | |
| tree | 8530e435acbe1737a06eb7fe0439181215e593bb /Lib/test/test_itertools.py | |
| parent | d66dd5ce68cbf4a33c385439d5eeb2bff4e860f1 (diff) | |
| download | cpython-e525ee3b483889313b62b09b4c9103d18dd9cbb7.zip cpython-e525ee3b483889313b62b09b4c9103d18dd9cbb7.tar.gz cpython-e525ee3b483889313b62b09b4c9103d18dd9cbb7.tar.bz2 | |
Document another recipe for itertools: all_equal(). Inspired by David Beazley.
Diffstat (limited to 'Lib/test/test_itertools.py')
| -rw-r--r-- | Lib/test/test_itertools.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py index 08c9f39..f940852 100644 --- a/Lib/test/test_itertools.py +++ b/Lib/test/test_itertools.py @@ -2014,6 +2014,11 @@ Samuele ... "Returns the nth item or a default value" ... return next(islice(iterable, n, None), default) +>>> def all_equal(iterable): +... "Returns True if all the elements are equal to each other" +... g = groupby(iterable) +... return next(g, True) and not next(g, False) + >>> def quantify(iterable, pred=bool): ... "Count how many times the predicate is true" ... return sum(map(pred, iterable)) @@ -2127,6 +2132,9 @@ perform as purported. >>> nth('abcde', 9) is None True +>>> [all_equal(s) for s in ('', 'A', 'AAAA', 'AAAB', 'AAABA')] +[True, True, True, False, False] + >>> quantify(range(99), lambda x: x%2==0) 50 |