list indices must be integers or slices, not str

list indices must be integers or slices, not strのエラーが出てきます。

posのsizeの中身だけ取り出すには、どうすれば良いでしょうか。

python
1
2import ccxt
3
4ftx = ccxt.ftx()
5pos = ftx.privateGetPositions()
6pos['result']['size']
7
8---------------------------------------------------------------------------
9TypeError                                 Traceback (most recent call last)
10<ipython-input-90-2b71651941e0> in <module>
11      6 # ポジションを取得
12      7 pos = ftx.privateGetPositions()
13----> 8 pos['result']['size']
14
15TypeError: list indices must be integers or slices, not str
16
17

ちなみにPOSの中身は以下です。

python
1
2{
3  "success": true,
4  "result": [
5    {
6      "cost": -31.7906,
7      "entryPrice": 138.22,
8      "estimatedLiquidationPrice": 152.1,
9      "future": "ETH-PERP",
10      "initialMarginRequirement": 0.1,
11      "longOrderSize": 1744.55,
12      "maintenanceMarginRequirement": 0.04,
13      "netSize": -0.23,
14      "openSize": 1744.32,
15      "realizedPnl": 3.39441714,
16      "shortOrderSize": 1732.09,
17      "side": "sell",
18      "size": 0.23,
19      "unrealizedPnl": 0,
20      "collateralUsed": 3.17906
21    }
22  ]
23}
24