python coroutine
python co-routine async and await tutorial
A chart and example
Sample https://docs.python.org/3/library/asyncio-task.html
import asyncio
async def compute(x, y):
print("Compute %s + %s ..." % (x, y))
await asyncio.sleep(1.0 * x * y)
return x + y
async def print_sum(x, y):
result = await compute(x, y)
print("%s + %s = %s" % (x, y, result))
loop = asyncio.get_event_loop()
loop.run_until_complete( asyncio.gather(print_sum(1, 2), print_sum(2, 3), print_sum(2, 2)) )
loop.close()
output
J:\temp>python co2.py
Compute 3 + 2 ...
Compute 2 + 2 ...
Compute 1 + 2 ...
1 + 2 = 3
2 + 2 = 4
3 + 2 = 5