try:
from _heapq import *
except ImportError:
pass
# When n>=size, it's faster to use sorted()
try:
size = len(iterable)
except (TypeError, AttributeError):
pass
else:
if n >= size:
return sorted(iterable, key=key)[:n]
for order, it in enumerate(map(iter, iterables)):
try:
next = it.__next__
value = next()
h_append([key(value), order * direction, value, next])
except StopIteration:
pass
_heapify(h)
来自 heapq.py
标签：...,except,value,next,try,pass From： https://www.cnblogs.com/sangern/p/17498357.html