Re: groupby behaviour

Discussion in 'Python' started by Ian Kelly, Feb 26, 2013.

  1. Ian Kelly

    Ian Kelly Guest

    On Tue, Feb 26, 2013 at 9:27 AM, andrea crotti
    <> wrote:
    > So I was trying to use groupby (which I used in the past), but I
    > noticed a very strange thing if using list on
    > the result:


    As stated in the docs:

    """
    The returned group is itself an iterator that shares the underlying
    iterable with groupby(). Because the source is shared, when the
    groupby() object is advanced, the previous group is no longer visible.
    So, if that data is needed later, it should be stored as a list:
    """
    Ian Kelly, Feb 26, 2013
    #1
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