for emisora in emisoras:

    url = 'http://bit.ly/oncedos-{}'.format(emisora)

    if emisora == 'ipc':
        df = pd.read_csv(url, index_col = 0, parse_dates = True,
                        usecols = ['Date', 'Close'])

        df.rename(columns = {'Close': 'PX_LAST'}, inplace = True)


    else:
        df = pd.read_csv(url, skiprows = 6, index_col = 0,
                        parse_dates = True, dayfirst = True,
                        usecols = ['Date', 'PX_LAST'])

    df.sort_index(inplace = True)

    precios_cierre = precios_cierre.join(df['PX_LAST'])
    precios_cierre.rename(columns = {'PX_LAST':emisora}, inplace = True)


    del df, url