[Python] how to call async function for timer in python

I would like two parameters: freq1 and freq2 to swap at a interval freq_change_interval - this is in a existing python project which already uses async in some methods, but the existing main(): method is not async.

The parameters are from the command line arguments, and the context of the project is that it reads in data from a software defined radio (SDR).

A cutdown copy of the module containing main(): looks like this:

import asyncio
import argparse
from tracker.common import ProcessConfig, ProcessResult, SampleConfig

def main():
p = argparse.ArgumentParser()
...
s_group = p.add_argument_group("Sampling")
...
s_group.add_argument(
"--freq1",
dest="freq1",
type=float,
default=SampleConfig.freq1,
help=" frequency 1 (default: %(default)s)",
)
s_group.add_argument(
"--freq2",
dest="freq2",
type=float,
default=SampleConfig.freq2,
help=" frequency 2 (default: %(default)s)",
)
s_group.add_argument(
"--interval",
dest="freq_change_interval",
type=float,
default=SampleConfig.freq_change_interval,
help=" interval (default: %(default)s)",
)

...

sample_config = SampleConfig(
freq1=args.freq1,
freq2=args.freq2,
freq_change_interval=args.freq_change_interval,
)

async def other_methods():

async def results_pipeline(....)

if __name__ == "__main__":
main()


I have read about async functions and the minimum examples I have seen I can not integrate into the context of the existing code.

Q: How can I have something working that resembles the pseudo code:

if sample_config.freq_change_interval > 0:
await asyncio.sleep(sample_config.freq_change_interval)
freq1, freq2 = freq2, freq1 # swap frequencies when interval is reached

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