create a vector (multiple columns in one new column) pandas

Question

Please, i have a dataframe like this:

data = {
    "a": [420, 380, 390],
    "b": [50, 40, 45],
    "c": [30, 22, 11],
    "d": [323, 2, 33]
}

df = pd.DataFrame(data)

a   b   c    d
0  420  50  30  323
1  380  40  22    2
2  390  45  11   33

and i want to get this result:

    a   d
        b   c    d
0  420  50  30  323
1  380  40  22    2
2  390  45  11   33

do you have any suggestions ?

i tried merge and concatenate but not working for me

Answer 1

Try this using pd.MultiIndex:

df.columns = pd.MultiIndex.from_arrays([[*'addd'],[*' bcd']])

Output:

     a   d         
         b   c    d
0  420  50  30  323
1  380  40  22    2
2  390  45  11   33