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Numpy Array of Sets

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Hi All, 

Hope you're doing great. One quick question. I am defining an array of sets using numpy as:

a=array([set([])]*3)

Now, if I want to add an element to the set in, lets say, a[0], and I use the .add(4) operation, which results in:

array([set([4]), set([4]), set([4])], dtype=object)

which I do not want. If I use the union operator 

a[0] = a[0] | set([4])

then I obtain what I want:

array([set([4]), set([]), set([])], dtype=object)

Can anyone explain whay this happens?

Thank you very much.

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Numpy Array of Sets Luis José Novoa <luisjosenovoa@gmail.com> - 2014-05-24 15:05 -0700
  Re: Numpy Array of Sets Robert Kern <robert.kern@gmail.com> - 2014-05-24 23:14 +0100
  Re: Numpy Array of Sets Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2014-05-25 00:25 +0200
    Re: Numpy Array of Sets LJ <luisjosenovoa@gmail.com> - 2014-05-25 05:29 -0700
      Re: Numpy Array of Sets Peter Otten <__peter__@web.de> - 2014-05-25 15:26 +0200
        Re: Numpy Array of Sets LJ <luisjosenovoa@gmail.com> - 2014-05-25 07:14 -0700
          Re: Numpy Array of Sets Peter Otten <__peter__@web.de> - 2014-05-25 17:12 +0200
            Re: Numpy Array of Sets LJ <luisjosenovoa@gmail.com> - 2014-05-25 08:17 -0700

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