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Python Concurrency for Senior Engineering Interviews

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Explore running event loops with Python's asyncio module, including asyncio.run() for Python 3.7+, managing multiple event loops, and scheduling callbacks. Understand how blocking affects the event loop and how to handle asynchronous tasks properly across different Python versions.

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Running the Event Loop

With Python 3.7+ the preferred way to run the event loop is to use the asyncio.run() method. The method is a blocking call till the passed-in coroutine finishes. A sample program appears below:

async def do_something_important():
    await asyncio.sleep(10)


if __name__ == "__main__":

  asyncio.run(do_something_important())

If you are working with Python 3.5, then the asyncio.run() API isn't available. In that case, we explicitly retrieve the event loop using asyncio.new_event_loop() and run our desired coroutine using run_until_complete() defined on the loop object. The code widget below ...