The Run() Function Of Asyncio Module In Python

Overview:

  • The run() method executes a coroutine on an asyncio event loop.

  • Before executing a coroutine, the run() method validates whether the parameter passed is a valid coroutine object. Before executing the coroutine, the method makes sure that no event loop is already running.
  • Unless a custom event loop is used, using the run() method is the recommended way for executing coroutines.

Example:

# Example Python program that executes
# coroutine(s) through asyncio.run() function 
import asyncio

# A simple coroutine that simulates collecting 
# orders
async def get_orders():
    for i in range(1, 11):
        print("Getting Order:%d"%i)
        await asyncio.sleep(0)

# A simple coroutine that simulates serving orders
async def serve_orders():
    for i in range(1, 11):
        print("Serving Order:%d"%i)
        await asyncio.sleep(0)

# A coroutine that awaits tasks
async def main():
    t1 = asyncio.create_task(get_orders())
    t2 = asyncio.create_task(serve_orders())
    await asyncio.wait([t1, t2])

# Execute the main coroutine through asyncio.run()
evtlp = asyncio.new_event_loop()    
asyncio.set_event_loop(evtlp)
asyncio.run(main())

Output:

Getting Order:1

Serving Order:1

Getting Order:2

Serving Order:2

Getting Order:3

Serving Order:3

Getting Order:4

Serving Order:4

Getting Order:5

Serving Order:5

Getting Order:6

Serving Order:6

Getting Order:7

Serving Order:7

Getting Order:8

Serving Order:8

Getting Order:9

Serving Order:9

Getting Order:10

Serving Order:10


Copyright 2022 © pythontic.com