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Replace map(None, *iterables) with zip(*iterables).

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Raymond Hettinger 2008-01-22 23:25:35 +00:00
parent 86def6cb2b
commit 1dfde1ddc0
9 changed files with 20 additions and 90 deletions
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6
Lib/heapq.py
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@ -351,7 +351,8 @@ def nsmallest(n, iterable, key=None):
Equivalent to: sorted(iterable, key=key)[:n]
"""
in1, in2 = tee(iterable)
it = izip(map(key, in1), count(), in2) # decorate
keys = in1 if key is None else map(key, in1)
it = izip(keys, count(), in2) # decorate
result = _nsmallest(n, it)
return list(map(itemgetter(2), result)) # undecorate
@ -362,7 +363,8 @@ def nlargest(n, iterable, key=None):
Equivalent to: sorted(iterable, key=key, reverse=True)[:n]
"""
in1, in2 = tee(iterable)
it = izip(map(key, in1), map(neg, count()), in2) # decorate
keys = in1 if key is None else map(key, in1)
it = izip(keys, map(neg, count()), in2) # decorate
result = _nlargest(n, it)
return list(map(itemgetter(2), result)) # undecorate