override column names read_excel
>>> names = [20140109, 20140213, 20140313, 20140410, 20140508, 20140612, 20140714]
>>> df = pd.read_excel("out.xlsx", header=None, names=names)
>>> df
20140109 20140213 20140313 20140410 20140508 20140612 20140714
0 0.619159 0.264191 0.438849 0.465287 0.445819 0.412582 0.397366
1 0.601379 0.303953 0.457524 0.432335 0.415333 0.382093 0.382361
2 0.579914 0.343715 0.418294 0.401129 0.385508 0.355392 0.355123