input record seperator (equivalent of "$|" of perl)

[Scott David Daniels]

Gábor Farkas wrote:
> Scott David Daniels wrote:
>> If you have python 2.3 or 2.4, you have itertools.
> for me it seems that 2.3 does not have itertools.groupby.
> it has itertools, but not itertools.groupby.

True. The 2.4 document says that itertools.groupby() is equivalent to:

     class groupby(object):
         def __init__(self, iterable, key=None):
             if key is None:
                 key = lambda x: x
             self.keyfunc = key
             self.it = iter(iterable)
             self.tgtkey = self.currkey = self.currvalue = xrange(0)
         def __iter__(self):
             return self
         def next(self):
             while self.currkey == self.tgtkey:
                 self.currvalue = self.it.next() # Exit on StopIteration
                 self.currkey = self.keyfunc(self.currvalue)
             self.tgtkey = self.currkey
             return (self.currkey, self._grouper(self.tgtkey))
         def _grouper(self, tgtkey):
             while self.currkey == tgtkey:
                 yield self.currvalue
                 self.currvalue = self.it.next() # Exit on StopIteration
                 self.currkey = self.keyfunc(self.currvalue)

So you could always just use that code.

--Scott David Daniels
Scott.Daniels at Acm.Org