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Python并发编程

  • 2026-07-01 05:00:53
Python并发编程
一.并发与并行
并发(Concurrency)并发并不是同一时刻有多个任务同时进行,相反,某个特定时刻,它只允许一个操作发生,只不过线程/任务之间会互相切换,直到完成.
并行(Parallelism)指的是系统真正同时执行多个任务,需要多核CPU,GPU等硬件条件

特性

并发(Concurrency

并行(Parallelism

目标

高效管理多任务

加速任务执行

执行方式

交替执行(逻辑同时)

真正同时执行(物理同时)

硬件依赖

单核即可实现

必须多核/多机

典型应用

I/O密集型、高响应系统

计算密集型任务

二.Python 并发编程Futures
在Python中,futures允许你提交任务(如函数调用)到线程池或进程池,并通过Future对象跟踪任务状态,获取结果或添加结果回调.
1.核心类

作用

适用场景

ThreadPoolExecutor

线程池(I/O密集型任务)

网络请求、文件读写等

ProcessPoolExecutor

进程池(CPU密集型任务)

计算密集型任务(如数学计算)

Future

表示异步计算的结果(通过 submit() 返回)

获取任务状态或结果

2.方法属性

方法/属性

作用

future.result()

阻塞直到任务完成并返回结果(可设置超时 timeout)。

future.done()

返回 True 如果任务已完成(包括取消或异常)。

future.cancel()

尝试取消任务(成功返回 True,否则 False)。

future.add_done_callback(fn)

添加回调函数,任务完成时自动调用。

futures.as_completed

接收一个 Future 对象的可迭代集合(如列表),返回一个迭代器,按照任务完成的顺序(谁先完成谁先返回)生成 Future 对象

3.创建执行器
from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor# 使用线程池(默认线程数为 CPU 核心数 * 5)with ThreadPoolExecutor(max_workers=4as executor:    pass# 使用进程池(默认进程数等于 CPU 核心数)with ProcessPoolExecutor() as executor:    pass
4.单线程实现文件下载
import requestsimport timeimport threadingimport concurrent.futuresdef download_one(url):    resp=requests.get(url)    print(f"read {len(resp.content)} from {url}")def download_all(sites):    for site in sites:        download_one(site)def main():    sites=[        'https://www.baidu.com',        'https://www.ctrip.com',        'https://www.douban.com/',        'https://www.youku.com',        'https://www.deepseek.com/',        'https://time.geekbang.org/',        'https://leetcode.cn/'    ]    start_time=time.perf_counter()    download_all(sites)    end_time=time.perf_counter()    print(f"download {len(sites)} in {end_time-start_time} seconds")if __name__=='__main__':    main()
5.多线程实现文件下载
import requestsimport timeimport threadingimport concurrent.futuresdef download_one(url):    resp=requests.get(url)    print(f"read {len(resp.content)} from {url}")def download_all(sites):    with concurrent.futures.ThreadPoolExecutor(max_workers=5as executor:        to_do = []        for site in sites:            future = executor.submit(download_one, site)            to_do.append(future)        for future in concurrent.futures.as_completed(to_do):            future.result()def main():    sites=[        'https://www.baidu.com',        'https://www.ctrip.com',        'https://www.douban.com/',        'https://www.youku.com',        'https://www.deepseek.com/',        'https://time.geekbang.org/',        'https://leetcode.cn/'    ]    start_time=time.perf_counter()    download_all(sites)    end_time=time.perf_counter()    print(f"download {len(sites)} in {end_time-start_time} seconds")if __name__=='__main__':    main()
三.多线程&Asyncio
如果是I/O Bound(I/O密集型),并且I/O操作很慢,需要多任务/线程协同实现,这个时候使用Asyncio更适合
如果是I/O Bound,但是I/O操作很快,只需要有限数量的任务/线程,那么使用多线程
如果是CPU bound,则需要使用多进程来提高程序效率

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  1. CONNECT:[ UseTime:0.000802s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000782s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000507s ]
  8. SELECT * FROM `article` WHERE `id` = 493612 LIMIT 1 [ RunTime:0.000591s ]
  9. UPDATE `article` SET `lasttime` = 1783073502 WHERE `id` = 493612 [ RunTime:0.000803s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000219s ]
  11. SELECT * FROM `article` WHERE `id` < 493612 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001912s ]
  12. SELECT * FROM `article` WHERE `id` > 493612 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000366s ]
  13. SELECT * FROM `article` WHERE `id` < 493612 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001287s ]
  14. SELECT * FROM `article` WHERE `id` < 493612 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005426s ]
  15. SELECT * FROM `article` WHERE `id` < 493612 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002327s ]
0.144786s