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:
import pandas
df = pandas.DataFrame.from_items([('CCC', [5]), ('BBB', [1]), ('AAA', [4])])
df.columns
# outputs Index([u'CCC', u'BBB', u'AAA'], dtype='object')
in C++ when passing df to foo.
foo(const boost::python::object in_obj)
{
boost::python::stl_input_iterator<boost::python::object> it (in_obj), end;
int index=0;
for(; it != end; it++) { auto extracted =
boost::python::extract<char const *> (*it); char const * colname = extracted;
std::cout<<"index="<<index<<", colname="<<colname<<std::endl; index++;
} } //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++?
Thank you.
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