[英]Making a tqdm progress bar for asyncio
我正在嘗試收集異步任務的 tqdm 進度條。
希望進度條在任務完成后逐步更新。 試過代碼:
import asyncio
import tqdm
import random
async def factorial(name, number):
f = 1
for i in range(2, number+1):
await asyncio.sleep(random.random())
f *= i
print(f"Task {name}: factorial {number} = {f}")
async def tq(flen):
for _ in tqdm.tqdm(range(flen)):
await asyncio.sleep(0.1)
async def main():
# Schedule the three concurrently
flist = [factorial("A", 2),
factorial("B", 3),
factorial("C", 4)]
await asyncio.gather(*flist, tq(len(flist)))
asyncio.run(main())
...但這只是完成了 tqdm 條然后處理階乘。
有沒有辦法讓進度條在每個異步任務完成后移動?
現在,我對asyncho
並不是特別熟悉,盡管我在 python 中的多進程中使用了tqdm
並取得了一些成功。 對您的代碼進行的以下更改似乎會更新進度條並同時打印結果,這可能足以讓您入門。
responses = [await f
for f in tqdm.tqdm(asyncio.as_completed(flist), total=len(flist))]
以上內容應替換main
定義中的await asyncio.gather(*flist, tq(len(flist)))
。
有關更多信息,以上內容的靈感來自帶有 tqdm 的asyncio aiohttp 進度條
為了只打印一次並更新它,我執行了以下操作,更新了進度條的描述以包含您的消息:
import asyncio
import tqdm
async def factorial(name, number):
f = 1
for i in range(2, number + 1):
await asyncio.sleep(1)
f *= i
return f"Task {name}: factorial {number} = {f}"
async def tq(flen):
for _ in tqdm.tqdm(range(flen)):
await asyncio.sleep(0.1)
async def main():
# Schedule the three concurrently
flist = [factorial("A", 2),
factorial("B", 3),
factorial("C", 4)]
pbar = tqdm.tqdm(total=len(flist))
for f in asyncio.as_completed(flist):
value = await f
pbar.set_description(value)
pbar.update()
if __name__ == '__main__':
asyncio.run(main())
從tqdm 版本 4.48.0 開始,可以使用tqdm.asyncio.tqdm.as_completed()
import tqdm.asyncio
...
for f in tqdm.asyncio.tqdm.as_completed(flist):
await f
以pbar
格式對 Dragos 的代碼進行了一些小改動,並使用tqdm.write()
幾乎得到了我想要的,如下所示:
import asyncio
import random
import tqdm
async def factorial(name, number):
f = 1
for i in range(2, number + 1):
await asyncio.sleep(random.random())
f *= i
return f"Task {name}: factorial {number} = {f}"
async def tq(flen):
for _ in tqdm.tqdm(range(flen)):
await asyncio.sleep(0.1)
async def main():
flist = [factorial("A", 2),
factorial("B", 3),
factorial("C", 4)]
pbar = tqdm.tqdm(total=len(flist), position=0, ncols=90)
for f in asyncio.as_completed(flist):
value = await f
pbar.set_description(desc=value, refresh=True)
tqdm.tqdm.write(value)
pbar.update()
if __name__ == '__main__':
asyncio.run(main())
這是一個圍繞 TQDM 的異步包裝器,用於返回有序結果:
import asyncio
from typing import Any, Coroutine, Iterable, List, Tuple
from tqdm import tqdm
async def aprogress(tasks: Iterable[Coroutine], **pbar_kws: Any) -> List[Any]:
"""Runs async tasks with a progress bar and returns an ordered result."""
if not tasks:
return []
async def tup(idx: int, task: Coroutine) -> Tuple[int, Any]:
"""Returns the index and result of a task."""
return idx, await task
_tasks = [tup(i, t) for i, t in enumerate(tasks)]
pbar = tqdm(asyncio.as_completed(_tasks), total=len(_tasks), **pbar_kws)
res = [await t for t in pbar]
return [r[1] for r in sorted(res, key=lambda r: r[0])]
if __name__ == "__main__":
import random
async def test(idx: int) -> Tuple[int, int]:
sleep = random.randint(0, 5)
await asyncio.sleep(sleep)
return idx, sleep
_tasks = [test(i) for i in range(10)]
_res = asyncio.run(aprogress(_tasks, desc="pbar test"))
print(_res)
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