This question already has answers here:
asynchronous python itertools chain multiple generators (2 answers)
Closed 2 years ago.
I would like to listen for events from multiple instances of the same object and then merge this event streams to one stream. For example, if I use async generators:
class PeriodicYielder:
def __init__(self, period: int) -> None:
self.period = period
async def updates(self):
while True:
await asyncio.sleep(self.period)
yield self.period
I can successfully listen for events from one instance:
async def get_updates_from_one():
each_1 = PeriodicYielder(1)
async for n in each_1.updates():
print(n)
# 1
# 1
# 1
# ...
But how can I get events from multiple async generators? In other words: how can I iterate through multiple async generators in the order they are ready to produce next value?
async def get_updates_from_multiple():
each_1 = PeriodicYielder(1)
each_2 = PeriodicYielder(2)
async for n in magic_async_join_function(each_1.updates(), each_2.updates()):
print(n)
# 1
# 1
# 2
# 1
# 1
# 2
# ...
Is there such magic_async_join_function in stdlib or in 3rd party module?
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