[C++-sig] Boost Python. access pandas columns in the same order as in python

[Jim Bosch]

Note that in Python 3.3+, dict order is nondeterministic, not just
arbitrary:

http://stackoverflow.com/questions/14956313/dictionary-ordering-non-deterministic-in-python3

So if these are invoking dict ordering under the hood, anything is possible.

Jim




On Wed, Oct 5, 2016 at 12:31 PM, Stefan Seefeld <stefan at seefeld.name> wrote:

> On 04.10.2016 09:05, Vladimir Sakharuk wrote:
> >
> > Hello All,
> >
> >
> > Trying to figure out how to c++ access pandas dataframe columns in the
> > same order as they exist in the python.
> >
> > in python:
> >
>
> [...]
>
> > ||
> > |    //outputs regardless of original order of column names.
> > //index=0, colname=AAA    //index=1, colname=BBB    //index=2,
> > colname=CCC|
> >
> > As you can see pythons' order 'CCC','BBB','AAA' is not same as c++
> > 'AAA', 'BBB', 'CCC'. Looks like those order depend on object hasing.
> >
> >
> > How could I get those values in the original order of pandas dataframe
> > from C++?
> >
>
> I can't reproduce that; I see the same order (['CCC', 'BBB', 'AAA'])
> both in Python and in C++ with your code above.
>
> FWIW,
>         Stefan
>
>
> --
>
>       ...ich hab' noch einen Koffer in Berlin...
>
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