How to increment date by week?

[Giorgos Tzampanakis]

On 2013-06-04, PieGuy wrote:

>    Starting on any day/date, I would like to create a one year list, by
>    week (start date could be any day of week).  Having a numerical week
>    index in front of date, ie 1-52, would be a bonus.  
>    ie, 1.  6/4/2013
>        2.  6/11/2013
>        3.  6/18/2013....etc to # 52.

date2 = date1 + datetime.timedelta(7)

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