Created
November 17, 2020 12:52
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| ''' | |
| There are 2 types of functions normal `def func()` and `async def func()`: | |
| - An asyc function can call async functions as well as normal ones | |
| - A normal function can only call normal functions | |
| ''' | |
| #%% | |
| import asyncio | |
| import datetime | |
| async def main(): | |
| print("start", datetime.datetime.now()) | |
| await asyncio.sleep(3) | |
| print("end", datetime.datetime.now()) | |
| return 5 | |
| async def more_main(): | |
| #%% | |
| print("This will run one after the other") | |
| coroutine = main() # Create the coroutine instance, it will not run it | |
| await coroutine # Run the instance and wait for it | |
| await main() # Create and run it directly | |
| #%% | |
| print("This will run in parallel") | |
| task1 = asyncio.create_task(main()) # This starts the task directly in the background | |
| task2 = asyncio.create_task(main()) | |
| await task1 # Wait for the result | |
| await task2 | |
| #%% | |
| print("This will also run in parallel") | |
| await asyncio.gather(main(), main()) # The same, but for a list of coroutines | |
| #%% | |
| # This is necessary when running in a script to start the | |
| # main async loop. You can have only one of these per thread. | |
| coroutine = more_main() | |
| asyncio.run(coroutine) |
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