def DFConcatStrDrop(df, baserow=0, concatrow=1, ds=''):
    """concat concatrow strings to baserow strings
    then drop concatrow
    ds = delimit string (blank by default)"""
    from pandas import DataFrame
    h = df.columns.values
    br, cr = baserow, concatrow
    for i in range(len(h)):
        if type(df.iat[br, i]) == type(df.iat[cr, i]) == type(''):
            df.iat[br, i] += ds + df.iat[cr, i]
    df = df.drop(df.index[cr])
    return df
