Python 3.x 无法更新SQLite表

我无法使update语句正常工作：（-关于我缺少的内容有什么帮助吗

tickers = c.fetchall()   
for row in tickers:
    c.execute("select [Adj Close] from StockData where Symbol = ? ", (row))
    AdjClose = c.fetchall()
    df_ta = pd.DataFrame(data = AdjClose, dtype=numpy.float64)
    df_ta = df_ta.apply(lambda c: talib.RSI(c, timeperiod = 14))
    for index, item in df_ta.iterrows():
        try:
            c.execute('''UPDATE StockData SET RSI = ? where Symbol = ? ''', (item.values, row))
        except Exception as e:
            print('Update Error: ' + str(e))
    print('Updated' + str(row))        
    conn.commit()
print ("Number of rows updated: {}".format(c.rowcount))```

Update Error: Error binding parameter 1 - probably unsupported type.