Re: numpy column_stack - why does this work?

Newsgroups	comp.lang.python
Date	2015-11-16 00:02 -0800
References	<0b4725a8-a040-4bfb-b046-81c2e529447a@googlegroups.com> <mailman.293.1447435057.16136.python-list@python.org>
Message-ID	<96d95669-5cf5-4a33-ba51-878edd975e48@googlegroups.com> (permalink)
Subject	Re: numpy column_stack - why does this work?
From	PythonDude <mjoerg.phone@gmail.com>

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On Friday, 13 November 2015 18:17:59 UTC+1, Ian  wrote:
> On Fri, Nov 13, 2015 at 8:37 AM, PythonDude <mjoexxxxx.com> wrote:
> > 3) I DON'T understand why the code doesn't look like this:
> >
> > means, stds = np.column_stack([
> >     for _ in xrange(n_portfolios):
> >       getMuSigma_from_PF(return_vec) ])
> 
> Because that would be invalid syntax; you can't put a for loop inside
> an expression like that. Your question is not about numpy.column_stack
> at all, but about list comprehensions. I suggest you start by reading
> this:
> 
> https://docs.python.org/3/tutorial/datastructures.html#list-comprehensions
> 
> Then if you're still confused, come back and ask further questions.

Thank you very much, I'll look careful into that before asking again :-)

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numpy column_stack - why does this work? PythonDude <mjoerg.phone@gmail.com> - 2015-11-13 07:37 -0800
  Re: numpy column_stack - why does this work? Ian Kelly <ian.g.kelly@gmail.com> - 2015-11-13 10:16 -0700
    Re: numpy column_stack - why does this work? PythonDude <mjoerg.phone@gmail.com> - 2015-11-16 00:02 -0800

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