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Python 中如何实现多线程?

  • 2026-06-28 14:24:15
Python 中如何实现多线程?
接口明明不慢,单个请求 200ms,批量跑 5000 个却要十几分钟。

这种代码我见过不少,打开一看,基本都是一个 for 循环从头怼到尾:

for user_id in user_ids:
    profile = load_user_profile(user_id)
    write_snapshot(profile)

这地方我第一眼不会怀疑 Python 慢,也不会先去优化函数内部。只要里面有网络请求、文件读写、数据库查询,八成是线程没用上。

Python 做多线程,最常见有两种写法:threading.Thread 和 ThreadPoolExecutor

平时业务代码里,我更愿意用后者。线程池可控,不容易一激动创建几千个线程,把机器搞得风扇起飞。

比如一个批量拉用户状态的脚本,接口偶尔会抖,不能一个失败就把整批任务干废:

import time
import random
from concurrent.futures import ThreadPoolExecutor, as_completed


defquery_user_status(user_id):
    begin = time.time()

# 这里模拟一次远程接口调用
    time.sleep(random.uniform(0.050.3))

if user_id % 17 == 0:
raise RuntimeError(f"remote api timeout, user_id={user_id}")

    cost_ms = int((time.time() - begin) * 1000)
return {
"user_id": user_id,
"status""ACTIVE",
"cost_ms": cost_ms
    }


defbatch_query(user_ids):
    ok_rows = []
    bad_rows = []

with ThreadPoolExecutor(max_workers=12, thread_name_prefix="user-sync"as pool:
        future_map = {
            pool.submit(query_user_status, user_id): user_id
for user_id in user_ids
        }

for future in as_completed(future_map):
            user_id = future_map[future]
try:
                row = future.result()
                ok_rows.append(row)
except Exception as e:
                bad_rows.append((user_id, str(e)))

return ok_rows, bad_rows


if __name__ == "__main__":
    users = list(range(1101))
    ok, bad = batch_query(users)

    print("success:", len(ok))
    print("failed:", bad[:5])

这段代码能解决大部分“批量处理慢”的问题。

注意,我这里没有把 max_workers 写成 100、200。线程不是越多越好。接口慢的时候,加线程确实能把等待时间叠起来,但线程多了以后,调度、连接数、下游限流都会跟着来。

线上我一般先从 8、12、16 这种数开始试,而不是拍脑袋写个 100。

如果任务之间要共享数据,就别随手改全局变量。这个坑很阴,开发环境跑 20 条数据没问题,上线跑 20 万条,数量偶尔少几条,日志还看不出来。

比如下面这种写法,看着没毛病,其实不稳:

total = 0

defadd_count():
global total
    total += 1

total += 1 不是一个不可拆的动作,中间可能被别的线程插进来。

要么用锁:

import threading
from concurrent.futures import ThreadPoolExecutor


classCounter:
def__init__(self):
        self.value = 0
        self._lock = threading.Lock()

defincr(self, step=1):
with self._lock:
            self.value += step


defhandle_one_line(line, counter):
if"ERROR"in line:
        counter.incr()


if __name__ == "__main__":
    lines = [
"INFO order created",
"ERROR payment timeout",
"WARN retry later",
"ERROR inventory locked",
    ] * 1000

    counter = Counter()

with ThreadPoolExecutor(max_workers=6as pool:
for line in lines:
            pool.submit(handle_one_line, line, counter)

    print(counter.value)

不过锁也别乱加。锁加大了,多线程又退化成单线程。能让每个线程自己算自己的结果,最后再汇总,就别共享一个变量。

另一种更常见的写法,是用 queue.Queue 做生产者消费者。

我处理日志、导文件、补数据的时候经常这么写。一个线程负责读,几个线程负责处理,最后再统一落盘或者写库。

import queue
import threading
import time


task_queue = queue.Queue(maxsize=1000)
stop_flag = object()


defread_log_file(file_path):
with open(file_path, "r", encoding="utf-8"as f:
for line in f:
if"orderId="in line:
                task_queue.put(line.strip())

for _ in range(4):
        task_queue.put(stop_flag)


defparse_worker(worker_no):
whileTrue:
        line = task_queue.get()

try:
if line is stop_flag:
return

# 模拟解析日志里的订单号
            order_id = line.split("orderId=")[-1].split()[0]
            time.sleep(0.02)

            print(f"worker={worker_no}, order_id={order_id}")

finally:
            task_queue.task_done()


if __name__ == "__main__":
    reader = threading.Thread(
        target=read_log_file,
        args=("app.log",),
        name="log-reader"
    )

    workers = [
        threading.Thread(target=parse_worker, args=(i,), name=f"log-parser-{i}")
for i in range(4)
    ]

    reader.start()
for t in workers:
        t.start()

    reader.join()
    task_queue.join()

for t in workers:
        t.join()

这段代码有两个细节。

一个是 Queue(maxsize=1000),我不喜欢无限队列。读文件太快,处理太慢,内存会被撑起来。加个大小限制,至少能让读取端等等后面的处理线程。

另一个是 stop_flag。线程不能靠猜结束,尤其是消费者线程。没有明确退出信号,就容易卡在 get() 那里,脚本看着没报错,就是不结束。

还有个绕不开的问题:Python 多线程到底能不能提升性能?

得看任务类型。

如果是请求接口、读写文件、查数据库、扫日志,多线程通常是有效的。因为线程大部分时间在等 IO,CPU 没怎么干活。

如果是压缩图片、跑复杂计算、解析大 JSON、大量加密解密,这种 CPU 密集任务,多线程效果就别抱太大希望。Python 里有 GIL,多个线程不等于多个 CPU 核同时猛跑。这个时候我一般换 multiprocessing,或者把重活丢给 C 扩展、NumPy、外部服务处理。

还有一点,线程里的异常不会像主线程那样直接把你喊醒。

用 ThreadPoolExecutor 的好处就在这里,future.result() 会把异常重新抛出来。你能知道哪条数据炸了,而不是线程悄悄死掉,主流程还打印一个“执行完成”。

多线程不是为了把代码写得高级。

它解决的是很具体的问题:大量任务都在等,主线程却傻站着一个个排队。只要确认瓶颈在 IO,线程池基本就是第一把刀。先把并发数控住,再把异常、超时、退出信号补齐,这代码才敢放到生产脚本里跑。

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  1. CONNECT:[ UseTime:0.000653s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000345s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000363s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000664s ]
  6. SELECT * FROM `set` [ RunTime:0.000271s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000695s ]
  8. SELECT * FROM `article` WHERE `id` = 500200 LIMIT 1 [ RunTime:0.000472s ]
  9. UPDATE `article` SET `lasttime` = 1783105913 WHERE `id` = 500200 [ RunTime:0.038287s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000601s ]
  11. SELECT * FROM `article` WHERE `id` < 500200 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000833s ]
  12. SELECT * FROM `article` WHERE `id` > 500200 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000832s ]
  13. SELECT * FROM `article` WHERE `id` < 500200 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009636s ]
  14. SELECT * FROM `article` WHERE `id` < 500200 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005731s ]
  15. SELECT * FROM `article` WHERE `id` < 500200 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003296s ]
0.176516s