Re: Why is there difference between cmd line and .py file?

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From	Joel Goldstick <joel.goldstick@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: Why is there difference between cmd line and .py file?
Date	Tue, 5 Jan 2016 15:58:18 -0500
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On Tue, Jan 5, 2016 at 3:45 PM, Robert <rxjwg98@gmail.com> wrote:

> On Tuesday, January 5, 2016 at 3:37:53 PM UTC-5, John Gordon wrote:
> > In <e9f1d94f-4dd6-49b5-bf5c-bbcdc8d304e8@googlegroups.com> Robert <
> r--@gmail.com> writes:
> >
> > > ////////////
> > > # represent the experiments
> > > head_counts = np.array([5,9,8,4,7])
> >
> > The code doesn't define 'np', so this line should produce an error.
> >
> > The code you linked contains this import:
> >
> >     import numpy as np
> >
> > However you didn't show it here, so I wonder if you posted the real code.
> >
> > > sum(expectation_A)[0]
> > >
> ---------------------------------------------------------------------------
> > > IndexError                                Traceback (most recent call
> last)
> > > <ipython-input-145-d6f33dff0343> in <module>()
> > > ----> 1 sum(expectation_A)[0]
> >
> > > IndexError: invalid index to scalar variable.
> > > //////////////
> >
> > The built-in function sum() returns a single value, not a list, so this
> > is a reasonable error.
> >
> > I suspect the code actually intended to call numpy.sum(), which does
> > return a list (or something like a list).
> >
> > --
> > John Gordon                   A is for Amy, who fell down the stairs
> > gordon@panix.com              B is for Basil, assaulted by bears
> >                                 -- Edward Gorey, "The Gashlycrumb Tinies"
>
> Thanks, John. When I typed my new thought, your reply came. You are right.
>  The attached message missed numpy import (In my file, it had).
>
> Now, I cannot use np.sum. It has an error, see below please. How can I use
> the numpy sum()?
>
> Thanks,
> /////////
> import numpy as np
>
> In [154]: np.sum(expectation_A)[0]
> ---------------------------------------------------------------------------
> IndexError                                Traceback (most recent call last)
> <ipython-input-154-1e2cbda689a3> in <module>()
> ----> 1 np.sum(expectation_A)[0]
>
> IndexError: invalid index to scalar variable.
>

I've not used numpy, but you should print expectation_A to see what's in
it.  It may be empty, causing the index.  It may be that expectation_A is
an integer, not a list

>
> --
> https://mail.python.org/mailman/listinfo/python-list
>



-- 
Joel Goldstick
http://joelgoldstick.com/stats/birthdays

Thread

Why is there difference between cmd line and .py file? Robert <rxjwg98@gmail.com> - 2016-01-05 12:25 -0800
  Re: Why is there difference between cmd line and .py file? John Gordon <gordon@panix.com> - 2016-01-05 20:37 +0000
    Re: Why is there difference between cmd line and .py file? Robert <rxjwg98@gmail.com> - 2016-01-05 12:45 -0800
      Re: Why is there difference between cmd line and .py file? Joel Goldstick <joel.goldstick@gmail.com> - 2016-01-05 15:58 -0500
        Re: Why is there difference between cmd line and .py file? Robert <rxjwg98@gmail.com> - 2016-01-05 13:05 -0800
        Re: Why is there difference between cmd line and .py file? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-01-06 00:21 +0100
    Re: Why is there difference between cmd line and .py file? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-01-06 16:25 +1100
  Re: Why is there difference between cmd line and .py file? Robert <rxjwg98@gmail.com> - 2016-01-05 12:41 -0800
    Re: Why is there difference between cmd line and .py file? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-01-06 00:25 +0100
      Re: Why is there difference between cmd line and .py file? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-01-06 16:18 +1100
  Re: Why is there difference between cmd line and .py file? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-01-06 16:33 +1100

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