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

It looks like I had other "bug" aka replacing with OrderedDict solved the problem.

________________________________
From: Cplusplus-sig <cplu...@python.org> on behalf of Jim Bosch <jbo...@astro.princeton.edu>
Sent: Wednesday, October 5, 2016 12:36 PM
To: Development of Python/C++ integration
Subject: Re: [C++-sig] Boost Python. access pandas columns in the same order as in python

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 <ste...@seefeld.name<mailto:ste...@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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