asyncio — Asynchronous I/O  Hello World! import asyncio

async def main():
    print('Hello ...')
    await asyncio.sleep(1)
    print('... World!')

asyncio.run(main())
  asyncio is a library to write concurrent code using the async/await syntax. asyncio is used as a foundation for multiple Python asynchronous frameworks that provide high-performance network and web-servers, database connection libraries, distributed task queues, etc. asyncio is often a perfect fit for IO-bound and high-level structured network code. asyncio provides a set of high-level APIs to:  
run Python coroutines concurrently and have full control over their execution; perform network IO and IPC; control subprocesses; distribute tasks via queues; 
synchronize concurrent code;  Additionally, there are low-level APIs for library and framework developers to:  create and manage event loops, which provide asynchronous APIs for networking, running subprocesses, handling OS signals, etc; implement efficient protocols using transports; 
bridge callback-based libraries and code with async/await syntax.  Availability: not Emscripten, not WASI.
This module does not work or is not available on WebAssembly platforms wasm32-emscripten and wasm32-wasi. See WebAssembly platforms for more information. Reference High-level APIs  Runners Coroutines and Tasks Streams Synchronization Primitives Subprocesses Queues Exceptions  Low-level APIs  Event Loop Futures Transports and Protocols Policies Platform Support Extending  Guides and Tutorials  High-level API Index Low-level API Index Developing with asyncio   Note The source code for asyncio can be found in Lib/asyncio/. 

    
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