不知道是不是刚更新的版本里新出现的，如果有读不到郑商所数据的，请找到rqdata文件，做出如下修改：

在vnpy.trader里的rqdata里，
class RqdataClient:
def to_rq_symbol(self, symbol: str, exchange: Exchange) -> str:
"""
CZCE product of RQData has symbol like "TA1905" while
vt symbol is "TA905.CZCE" so need to add "1" in symbol.
"""

# Equity
if exchange in [Exchange.SSE, Exchange.SZSE]:
    if exchange == Exchange.SSE:
        rq_symbol = f"{symbol}.XSHG"
    else:
        rq_symbol = f"{symbol}.XSHE"
# Futures and Options
elif exchange in [Exchange.SHFE, Exchange.CFFEX, Exchange.DCE, Exchange.DCE, Exchange.INE]

其中最后一行有两个DCE，把其中一个改成CZCE

确实是个BUG，我们修复下