loadData.py

filename = "smal.tsv"
keyname = "someKeyname"
self.data[keyname] = spectral_data(pd.read_csv(filename, header=[0, 1], verbose=True))

preproc.py

class spectral_data(object):
    def __init__(self, df):

        try:
            uppercols = df.columns.levels[0]
            lowercols = list(df.columns.levels[1].values)
        except:
            df.columns = pd.MultiIndex.from_tuples(list(df.columns))
            uppercols = df.columns.levels[0]
            lowercols = list(df.columns.levels[1].values)

        for i, val in enumerate(lowercols):
            try:
                lowercols[i] = float(val)
            except:
                lowercols[i] = val

        levels = [uppercols, lowercols]
        df.columns.set_levels(levels, inplace=True)
        self.df = df

smal.tsv