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| author | Raymond Hettinger <python@rcn.com> | 2009-02-21 23:20:57 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2009-02-21 23:20:57 (GMT) |
| commit | ba86fa9d5f24aa33f994d3b7a4bd31fdd8cf70e8 (patch) | |
| tree | 08e664e1e07258ced67c1968358c98704f844f8d | |
| parent | 912fbcade3789b6a3dff75f46e564bbe74d0c20b (diff) | |
| download | cpython-ba86fa9d5f24aa33f994d3b7a4bd31fdd8cf70e8.zip cpython-ba86fa9d5f24aa33f994d3b7a4bd31fdd8cf70e8.tar.gz cpython-ba86fa9d5f24aa33f994d3b7a4bd31fdd8cf70e8.tar.bz2 | |
In Py3.x, a list comprehension is now faster than list(map(itemgetter(0), iterable)).
| -rw-r--r-- | Lib/heapq.py | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/Lib/heapq.py b/Lib/heapq.py index b361631..19a457b 100644 --- a/Lib/heapq.py +++ b/Lib/heapq.py @@ -130,7 +130,6 @@ __all__ = ['heappush', 'heappop', 'heapify', 'heapreplace', 'merge', 'nlargest', 'nsmallest', 'heappushpop'] from itertools import islice, repeat, count, tee, chain -from operator import itemgetter import bisect def heappush(heap, item): @@ -377,13 +376,13 @@ def nsmallest(n, iterable, key=None): if key is None: it = zip(iterable, count()) # decorate result = _nsmallest(n, it) - return list(map(itemgetter(0), result)) # undecorate + return [r[0] for r in result] # undecorate # General case, slowest method in1, in2 = tee(iterable) it = zip(map(key, in1), count(), in2) # decorate result = _nsmallest(n, it) - return list(map(itemgetter(2), result)) # undecorate + return [r[2] for r in result] # undecorate _nlargest = nlargest def nlargest(n, iterable, key=None): @@ -415,13 +414,13 @@ def nlargest(n, iterable, key=None): if key is None: it = zip(iterable, count(0,-1)) # decorate result = _nlargest(n, it) - return list(map(itemgetter(0), result)) # undecorate + return [r[0] for r in result] # undecorate # General case, slowest method in1, in2 = tee(iterable) it = zip(map(key, in1), count(0,-1), in2) # decorate result = _nlargest(n, it) - return list(map(itemgetter(2), result)) # undecorate + return [r[2] for r in result] # undecorate if __name__ == "__main__": # Simple sanity test |