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import asyncio

state = {"in_flight": 0, "peak": 0}


async def task(name, sem):
    async with sem:
        state["in_flight"] += 1
        state["peak"] = max(state["peak"], state["in_flight"])
        print(f"acquire:{name}:inflight={state['in_flight']}")
        await asyncio.sleep(0)
        await asyncio.sleep(0)
        state["in_flight"] -= 1
        print(f"release:{name}")


async def main():
    sem = asyncio.Semaphore(2)
    await asyncio.gather(*[task(c, sem) for c in "ABCDE"])
    print(f"peak:{state['peak']}")


asyncio.run(main())

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