It looks like I had other "bug" aka replacing with OrderedDict solved the problem.
________________________________ From: Cplusplus-sig <cplusplus-sig-bounces+vsakharuk=tower-research....@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... _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org<mailto:Cplusplus-sig@python.org> https://mail.python.org/mailman/listinfo/cplusplus-sig
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