async def main():
async with aiohttp.ClientSession() as session:
fetchers = [
fetch_status(session, 'https://www.example.com', 1),
fetch_status(session, 'https://www.example.com', 1),
fetch_status(session, 'https://www.example.com', 10)
]
for finished_task in asyncio.as_completed(fetchers):
print(await finished_task)
async def main():
async with aiohttp.ClientSession() as session:
api_a = fetch_status(session, 'https://www.example.com')
api_b = fetch_status(session, 'https://www.example.com', delay=2)
done, pending = await asyncio.wait([api_a, api_b], timeout=1)
for task in pending:
if task is api_b:
print('API B too slow, cancelling')
task.cancel()
async def main():
async with aiohttp.ClientSession() as session:
fetchers = \
[asyncio.create_task(fetch_status(session, 'https://example.com')),
asyncio.create_task(fetch_status(session, 'https://example.com'))]
done, pending = await asyncio.wait(fetchers)
print(f'Done task count: {len(done)}')
print(f'Pending task count: {len(pending)}')
for done_task in done:
result = await done_task
print(result)
async def main():
async with aiohttp.ClientSession() as session:
fetchers = [fetch_status(session, 'https://example.com', 1),
fetch_status(session, 'https://example.com', 10),
fetch_status(session, 'https://example.com', 10)]
for done_task in asyncio.as_completed(fetchers, timeout=2):
try:
result = await done_task
print(result)
except asyncio.TimeoutError:
print('We got a timeout error!')
for task in asyncio.tasks.all_tasks():
print(task)
async def main():
async with aiohttp.ClientSession() as session:
example_url = 'https://example.com'
fetchers = [
fetch_status(session, example_url),
fetch_status(session, example_url),
fetch_status(session, example_url, delay=3)
]
done, pending = await asyncio.wait(fetchers, timeout=1)
print(f'Done task count: {len(done)}')
print(f'Pending task count: {len(pending)}')
for done_task in done:
result = await done_task
print(result)
async def main():
async with aiohttp.ClientSession() as session:
url = 'https://www.example.com'
fetchers = [
asyncio.create_task(fetch_status(session, url)),
asyncio.create_task(fetch_status(session, url)),
asyncio.create_task(fetch_status(session, url))
]
done, pending = await asyncio.wait(fetchers,
return_when=asyncio.FIRST_COMPLETED)
print(f'Done task count: {len(done)}')
print(f'Pending task count: {len(pending)}')
for done_task in done:
print(await done_task)
async def main():
async with aiohttp.ClientSession() as session:
good_request = fetch_status(session, 'https://www.example.com')
bad_request = fetch_status(session, 'python://bad')
fetchers = [
asyncio.create_task(good_request),
asyncio.create_task(bad_request)
]
done, pending = await asyncio.wait(fetchers)
print(f'Done task count: {len(done)}')
print(f'Pending task count: {len(pending)}')
for done_task in done:
# result = await done_task will throw an exception
if done_task.exception() is None:
print(done_task.result())
else:
logging.error("Request got an exception",
exc_info=done_task.exception())
async def main():
async with aiohttp.ClientSession() as session:
fetchers = \
[asyncio.create_task(fetch_status(session, 'python://bad.com')),
asyncio.create_task(fetch_status(session, 'https://www.example.com', delay=3)),
asyncio.create_task(fetch_status(session, 'https://www.example.com', delay=3))]
done, pending = await asyncio.wait(fetchers,
return_when=asyncio.FIRST_EXCEPTION)
print(f'Done task count: {len(done)}')
print(f'Pending task count: {len(pending)}')
for done_task in done:
if done_task.exception() is None:
print(done_task.result())
else:
logging.error("Request got an exception",
exc_info=done_task.exception())
for pending_task in pending:
pending_task.cancel()
async def main():
async with aiohttp.ClientSession() as session:
urls = ['https://example.com' for _ in range(1000)]
requests = [fetch_status(session, url) for url in urls]
status_codes = await asyncio.gather(*requests)
print(status_codes)
