Use C heapreplace() instead of slower _siftup() in pure python.
diff --git a/Lib/heapq.py b/Lib/heapq.py
index 4c11eb6..5d41425 100644
--- a/Lib/heapq.py
+++ b/Lib/heapq.py
@@ -319,7 +319,7 @@
[0, 1, 2, 3, 4, 5, 5, 7, 8, 10, 15, 20, 25]
'''
- _heappop, siftup, _StopIteration = heappop, _siftup, StopIteration
+ _heappop, _heapreplace, _StopIteration = heappop, heapreplace, StopIteration
h = []
h_append = h.append
@@ -337,7 +337,7 @@
v, itnum, next = s = h[0] # raises IndexError when h is empty
yield v
s[0] = next() # raises StopIteration when exhausted
- siftup(h, 0) # restore heap condition
+ _heapreplace(h, s) # restore heap condition
except _StopIteration:
_heappop(h) # remove empty iterator
except IndexError: