[docs] [issue28939] Groupby Is Roughly Equivalent To ...

Greg Solomon report at bugs.python.org
Mon Dec 12 02:52:05 EST 2016

Greg Solomon added the comment:

Oh, I get it. There needs to be a next(self.it) loop in __next__ as well as in _grouper in case the user doesn't call _grouper.

My test was 
for ( k , g ) in groupby( L ):
    print ( k , len( list( g ) ) )
so I was executing _grouper on every row.

Thanks !!!

resolution:  -> not a bug
status: open -> closed

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