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Update itertools recipes to use next().

This commit is contained in:
Raymond Hettinger 2009-02-23 19:38:09 +00:00
parent 6d327b0d53
commit 21315ba9c8
1 changed files with 3 additions and 4 deletions
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7
Doc/library/itertools.rst
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@ -326,14 +326,14 @@ loops that truncate the stream.
return self return self
def __next__(self): def __next__(self):
while self.currkey == self.tgtkey: while self.currkey == self.tgtkey:
self.currvalue = next(self.it) # Exit on StopIteration self.currvalue = next(self.it) # Exit on StopIteration
self.currkey = self.keyfunc(self.currvalue) self.currkey = self.keyfunc(self.currvalue)
self.tgtkey = self.currkey self.tgtkey = self.currkey
return (self.currkey, self._grouper(self.tgtkey)) return (self.currkey, self._grouper(self.tgtkey))
def _grouper(self, tgtkey): def _grouper(self, tgtkey):
while self.currkey == tgtkey: while self.currkey == tgtkey:
yield self.currvalue yield self.currvalue
self.currvalue = next(self.it) # Exit on StopIteration self.currvalue = next(self.it) # Exit on StopIteration
self.currkey = self.keyfunc(self.currvalue) self.currkey = self.keyfunc(self.currvalue)
@ -652,8 +652,7 @@ which incur interpreter overhead.
def pairwise(iterable): def pairwise(iterable):
"s -> (s0,s1), (s1,s2), (s2, s3), ..." "s -> (s0,s1), (s1,s2), (s2, s3), ..."
a, b = tee(iterable) a, b = tee(iterable)
for elem in b: next(b, None)
break
return zip(a, b) return zip(a, b)
def grouper(n, iterable, fillvalue=None): def grouper(n, iterable, fillvalue=None):