pandas - Built-in support for converting column names into values? -

does pandas have built-in support converting this

   foo  bar  baz  color  texture 0  845  758  421    red   creamy 1  259  512  405    red  crunchy 2  784  304  477  green   creamy 3  584  909  505  green  crunchy 4  282  756  619   blue   creamy 5  251  910  983   blue  crunchy 

to this

   brand  color  texture  votes 0    foo    red   creamy    845 1    foo    red  crunchy    259 2    foo  green   creamy    784 3    foo  green  crunchy    584 4    foo   blue   creamy    282 5    foo   blue  crunchy    251 6    bar    red   creamy    758 7    bar    red  crunchy    512 8    bar  green   creamy    304 9    bar  green  crunchy    909 10   bar   blue   creamy    756 11   bar   blue  crunchy    910 12   baz    red   creamy    421 13   baz    red  crunchy    405 14   baz  green   creamy    477 15   baz  green  crunchy    505 16   baz   blue   creamy    619 17   baz   blue  crunchy    983 

?

in words: some of column headers have been converted values of new column brand, , values under these columns have been placed in new column votes.

(of course, names 'brand' , 'votes' of new columns cannot deduced original dataframe; they'd need provided additional data on top of original dataframe. also, 1 imagine additional information provided position of new columns among dataframe's columns.)

nb: don't implementing conversion simpler primitives. asking whether pandas has function it, , if so, it.

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fwiw, here's code generate starting dataframe shown above:

import pandas import itertools import random  color = ['red', 'green', 'blue'] texture = ['creamy', 'crunchy'] brand = ['foo', 'bar', 'baz']  random.seed(0) records = [tuple(random.randint(1, 10000) _ in brand) + p            p in itertools.product(color, texture)] columns = brand + ['color', 'texture'] dataframe = pandas.dataframe.from_records(records, columns=columns) 

you're looking melt:

>>> pandas.melt(dataframe, id_vars=["color", "texture"], var_name="brand",                             value_name="votes")     color  texture brand  votes 0     red   creamy   foo   6312 1     red  crunchy   foo   4243 2   green   creamy   foo   6635 3   green  crunchy   foo   5867 4    blue   creamy   foo   8269 5    blue  crunchy   foo   2290 6     red   creamy   bar   6891 7     red  crunchy   bar   8377 8   green   creamy   bar   4970 9   green  crunchy   bar   9559 10   blue   creamy   bar   2282 11   blue  crunchy   bar   1554 12    red   creamy   baz    664 13    red  crunchy   baz   7962 14  green   creamy   baz   7809 15  green  crunchy   baz   3579 16   blue   creamy   baz   4618 17   blue  crunchy   baz   4105 

afaik if want end particular order have handle yourself.