import pandas as pd

df = pd.DataFrame(
    {"a" : [4 ,5, 6],
     "b" : [7, 8, 9],
     "c" : [10, 11, 12]},
    index = [1, 2, 3])
df

	a	b	c
1	4	7	10
2	5	8	11
3	6	9	12