- 1 year ago
How to implement an asynchronous function in python 3
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To implement an asynchronous function in Python 3, you can use the async
and await
keywords along with the asyncio
library. Here's an example:
pythonimport asyncio
async def my_async_function():
print("Start")
# Simulate an asynchronous task
await asyncio.sleep(1)
print("End")
# Create an event loop
loop = asyncio.get_event_loop()
# Run the async function
loop.run_until_complete(my_async_function())
# Close the event loop
loop.close()
In the above example:
- The
my_async_function
is defined as an asynchronous function using theasync
keyword. - Inside the function, the
await
keyword is used to pause the execution and allow other tasks to run. - The
asyncio.sleep
function is used to simulate an asynchronous task that pauses the function for 1 second. - An event loop is created using
asyncio.get_event_loop()
. - The
my_async_function
is run until completion usingloop.run_until_complete()
. - After the function completes, the event loop is closed using
loop.close()
.
When you run the code, the output will be:
sqlStart
End
Note that in order to use asyncio
and run asynchronous functions, you need to have an event loop running. The event loop manages the execution of asynchronous tasks and ensures that they run concurrently.
Keep in mind that to fully leverage the benefits of asynchronous programming in Python, you'll often work with other asynchronous libraries or functions that support async
and await
syntax, such as network I/O operations or database queries.