Async Patterns

Patterns และ best practices สำหรับ asynchronous programming ใน Python

Gather Pattern

import asyncio

async def fetch_data(name, delay):
    '''Simulate async operation'''
    await asyncio.sleep(delay)
    return f"Result from {name}"

async def main():
    # Gather - run concurrent and wait for all
    results = await asyncio.gather(
        fetch_data("API 1", 0.1),
        fetch_data("API 2", 0.15),
        fetch_data("API 3", 0.1)
    )

    print(f"All results: {results}")
    # Results are in order of tasks

# asyncio.run(main())
print("gather(): run all concurrent, wait for all, return in order")
print("""
Usage:
    results = await asyncio.gather(coro1, coro2, coro3)

    # With return_exceptions=True
    # If one fails, others continue
    results = await asyncio.gather(*tasks, return_exceptions=True)

    for result in results:
        if isinstance(result, Exception):
            print(f"Error: {result}")
        else:
            print(f"Success: {result}")
""")