我下载最新的sdk demo，无法使用websocket功能

Websocket
1

我使用如下方式 安装的sdk
pip 安装后的在 ~/.local/lib/python3.10/site-packages/binance/websocket

### Python3

**SDK 1:** 可以通过以下方式获取Binance Futures Connector SDK：

* 访问 https://github.com/Binance-docs/binance-futures-connector-python
* 执行以下命令：
`pip install binance-futures-connector`

=======>
在 ~/.local/lib/python3.10/site-packages/binance/websocket/um_futures/websocket_client.py 下，__init__中没有onmessage 而是在成员函数中定义的callback。

class UMFuturesWebsocketClient(BinanceWebsocketClient):
    def __init__(self, stream_url="wss://fstream.binance.com"):
        super().__init__(stream_url)

    def agg_trade(self, symbol: str, id: int, callback, **kwargs):

我在 binance-futures-connector-python-main/examples/websocket/um_futures例子中看到的跟packages里的不一致

def message_handler(message):
    print(message)


my_client = UMFuturesWebsocketClient(on_message=message_handler)

my_client.kline(
    symbol="btcusdt",
    id=12,
    interval="1d",```


我的问题是
1.  我用下载的最新sdk demo 和sdk，不应该出现接口不匹配的问题
2.  我这个问题该如何解决
2

The websocket part has been modified for the recent version 4.0.0rc2, which has on_message at constructor __init__:

However, 4.0.0rc2 is pre-release version, so when you do pip install binance-futures-connector, you don’t download this version, instead you download the latest stable version at https://pypi.org/project/binance-futures-connector/#history, which is 3.3.1.

For you to download 4.0.0rc2 with improved WebSocket setup, you can run the following pip command:

pip install binance-futures-connector --pre

or

pip install binance-futures-connector==4.0.0rc2
3

pip install binance-futures-connector==4.0.0rc2
重新安装问题解决了

4