使用asyncio返回结果

Question

我有以下代码：

async def get_balance(exchange, symbol='BTC/USD'):
    freeBalance = await exchange.fetchBalance()
    symbol1_balance = freeBalance[symbol.split('/')[0]]
    symbol2_balance = freeBalance[symbol.split('/')[1]]
    return symbol1_balance, symbol2_balance

async def get_balances(exchanges):    
    futures = [get_balance(exchange) for exchange in exchanges]
    balances = await asyncio.gather(*futures)
    return balances

exchanges = [exchange1, exchange2, ...]
loop = asyncio.get_event_loop()
results = loop.run_until_complete(get_balances(exchanges))

但我得到了一个错误：

res = loop.run_until_complete(get_balances(exchanges, symbol))

Traceback (most recent call last):

File "C:\Users\Nicolas\Anaconda3\lib\asyncio\base_events.py", line 570, in run_until_complete self.run_forever()

File "C:\Users\Nicolas\Anaconda3\lib\asyncio\base_events.py", line 525, in run_forever raise RuntimeError('This event loop is already running')

RuntimeError: This event loop is already running

main:49: RuntimeWarning: coroutine 'binance.fetch_balance' was never awaited RuntimeWarning: Enable tracemalloc to get the object allocation traceback

main:49: RuntimeWarning: coroutine 'bitfinex.fetch_balance' was never awaited RuntimeWarning: Enable tracemalloc to get the object allocation traceback

要明确的是： 打印（交换[0].fetchBalance（））

<coroutine object binance.fetch_ticker at 0x000001FE6473BA48>

因此，函数get_balance已经是一个协程

我成功地运行了第一个asyncio-example-gather，但没有运行

asyncio.run(main())

File "C:\Users\Nicolas\Anaconda3\lib\asyncio\runners.py", line 34, in run "asyncio.run() cannot be called from a running event loop")

RuntimeError: asyncio.run() cannot be called from a running event loop

但以下工作：

loop = asyncio.get_running_loop()
res = loop.create_task(main())

我非常熟悉异步编程，以前更多地使用多线程。你知道这里怎么了吗

谢谢你们