怎么才能显示账户所有持仓品种和持仓手数

试试这样，详细请查楼上文档

from tqsdk import TqApi, TqAccount
api = TqApi(auth="信易账户,账户密码")
position = api.get_position()
# 假设已知持仓是SHFE.hc2101
hc = position.get("SHFE.hc2101")
if hc:
    print("hc浮动盈亏：", hc['float_profit'])
    print("hc持仓手数：", hc.pos)
# 假设未知持仓是SHFE.rb2101
rb = position.get("SHFE.rb2101")
if rb:
    print("rb浮动盈亏：", rb['float_profit'])
    print("rb持仓手数：", rb.pos)
else:
    print("SHFE.rb2101未持仓")
# 如果未知
l = list(position)
for x in l:
    open_price = position[x].open_price_long if position[x].pos>0 else position[x].open_price_short
    print(f"当前持仓{x}，手{position[x].pos}，开均价{open_price}")
print("下面方法等效")
for k,i in position.items():
    open_price = i.open_price_long if i.pos>0 else i.open_price_short
    print(f"当前持仓{k}，手{i.pos}，开均价{open_price}")
api.close()

文档有写：

https://doc.shinnytech.com/tqsdk/latest/reference/tqsdk.api.html#tqsdk.api.TqApi.get_position