ta库中boll 的 n += S[k] 报
Traceback (most recent call last):
File "E:/FMZ/binance-futures-connector-python-main/MyFmz.py", line 707, in <module>
boll = TA.BOLL(r, 22, 2)
File "E:/FMZ/binance-futures-connector-python-main/MyFmz.py", line 193, in BOLL
n += S[k]
TypeError: unsupported operand type(s) for +=: 'float' and 'list'

请梦总指导下怎么处理