AsyncIO in Python

Here are some insights into topics about the async programming in python

  import asyncio

  @async_timeit
  async def factorial(name, number):
      f = 1
      for i in range(2, number + 1):
          print(f"Task {name}: Compute factorial({number}), currently i={i}...")
          await asyncio.sleep(1)
          f *= i
      print(f"Task {name}: factorial({number}) = {f}")
      return f
  
  @async_timeit
  async def main():
      # Schedule three calls *concurrently*:
      L = await asyncio.gather(
          factorial("A", 2),
          factorial("B", 3),
          factorial("C", 4),
      )
      print(L)
  
  asyncio.run(main())

And the output in the shell will look like the following:

  Task A: Compute factorial(2), currently i=2...
  Task B: Compute factorial(3), currently i=2...
  Task C: Compute factorial(4), currently i=2...
  Task A: factorial(2) = 2
  func:'factorial' args:[('A', 2), {}] took: 1.0011 sec
  Task B: Compute factorial(3), currently i=3...
  Task C: Compute factorial(4), currently i=3...
  Task B: factorial(3) = 6
  func:'factorial' args:[('B', 3), {}] took: 2.0125 sec
  Task C: Compute factorial(4), currently i=4...
  Task C: factorial(4) = 24
  func:'factorial' args:[('C', 4), {}] took: 3.0248 sec
  [2, 6, 24]
  func:'main' args:[(), {}] took: 3.0248 sec