asncy await
时间: 2023-11-24 09:14:40 浏览: 48
async/await is a feature in modern programming languages, such as Python and JavaScript, that allows for asynchronous programming. It is commonly used for handling asynchronous operations, such as making API calls or performing file I/O, without blocking the execution of other tasks.
The `async` keyword is used to define an asynchronous function, and the `await` keyword is used to pause the execution of the function until a promise is resolved. By using `await`, the function can wait for the asynchronous operation to complete and then continue its execution.
Here's an example in Python:
```python
import asyncio
async def my_async_function():
print("Start")
await asyncio.sleep(1)
print("End")
asyncio.run(my_async_function())
```
In this example, the `my_async_function` is declared as an asynchronous function using the `async` keyword. Inside the function, `await asyncio.sleep(1)` pauses the execution of the function for 1 second asynchronously. This means other tasks can continue running while waiting for the sleep to complete.