for example, 

```
from pandas import DataFrame
df = DataFrame(np.arange(8).reshape(1, 8), columns = list('abcdefgh'))

```

I want to select the columns 'b':'d' and 'f':'h', say both inclusive.

I know I could select 'b':'d' by executing:

`df2 = df.loc[:, 'b':'d']`, but something like `df2 = df.loc[:, ['b':'d', 'f':'h']]`
which is like the syntax in MATLAB wouldn't work here, so how can I select several
columns in dataframe?