1. Read in the college dataset and assign the institution name (INSTNM) as the index:

>>> college = pd.read_csv('data/college.csv', index_col='INSTNM')

2. Use the Index method get_loc to find the integer position of the desired columns:

>>> col_start = college.columns.get_loc('UGDS_WHITE')
>>> col_end = college.columns.get_loc('UGDS_UNKN') + 1
>>> col_start, col_end

3. Use col_start and col_end to select columns by integer location using .iloc:

>>> college.iloc[:5, col_start:col_end]