python - Concatenate columns and use the column names as a binary feature in a new column -

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i have dataframe 2 columns contain same type of data:

 id   foo   bar 1    f1    b1 2    f2    b2 3    f3    b3

i know how concatenate 2 columns, foo , bar appear in additional column binary feature indicating column came from, so:

 id   foobar  column 1    f1      foo 2    f2      foo 3    f3      foo 4    b1      bar 5    b2      bar 6    b3      bar

how can achieve that?

you do:

df = dataframe({'foo': ['f1', 'f2', 'f3'], 'bar': ['b1', 'b2', 'b3']})  print df    bar foo 0  b1  f1 1  b2  f2 2  b3  f3  cols = ''.join(list(df)) df = concat([df.foo, df.bar], keys=df.columns).reset_index(0) df.columns = ['source', cols] print df    source barfoo 0    bar     f1 1    bar     f2 2    bar     f3 0    foo     b1 1    foo     b2 2    foo     b3

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