Geoffrey Zhu wrote: > Hi All, > > I want to construct a numpy array based on Python objects. In the > below code, opts is a list of tuples. > > For example, > > opts=[ ('C', 100, 3, 'A'), ('K', 200, 5.4, 'B')] > > If I use a generator like the following: > > K=numpy.array(o[2]/1000.0 for o in opts) > > It does not work. > > I have to use: > > numpy.array([o[2]/1000.0 for o in opts]) > > Is this behavior intended?
Yes. With arbitrary generators, there is no good way to do the kind of mind-reading that numpy.array() usually does with sequences. It would have to unroll the whole generator anyways. fromiter() works for this, but you are restricted to 1-D arrays which is a lot easier to implement the mind-reading for. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion