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bpo-41006: collections imports lazily heap #20940

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Jun 17, 2020
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bpo-41006: collections imports lazily heap #20940

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6 changes: 4 additions & 2 deletions Lib/collections/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,6 @@
]

import _collections_abc
import heapq as _heapq
import sys as _sys

from itertools import chain as _chain
Expand Down Expand Up @@ -608,7 +607,10 @@ def most_common(self, n=None):
# Emulate Bag.sortedByCount from Smalltalk
if n is None:
return sorted(self.items(), key=_itemgetter(1), reverse=True)
return _heapq.nlargest(n, self.items(), key=_itemgetter(1))

# Lazy import to speedup Python startup time
import heapq
return heapq.nlargest(n, self.items(), key=_itemgetter(1))

def elements(self):
'''Iterator over elements repeating each as many times as its count.
Expand Down