Serhiy Storchaka added the comment:
Here is a Python implementation of the idea #2:
from itertools import tee
def groupby(iterable, key=None):
if key is None:
key = lambda x: x
def grouper(currvalue, it, tgtkey):
yield currvalue
for currvalue in it:
if key(currvalue) != tgtkey:
break
yield currvalue
it = iter(iterable)
tgtkey = init = object()
while True:
try:
currvalue = next(it)
except StopIteration:
return
currkey = key(currvalue)
if tgtkey is init or currkey != tgtkey:
tgtkey = currkey
it, it2 = tee(it)
yield (currkey, grouper(currvalue, it2, tgtkey))
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<http://bugs.python.org/issue30346>
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