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学习Python多线程与多进程常用编写

  • 2026-06-30 16:32:33
学习Python多线程与多进程常用编写
  • Python 多线程与多进程全方位学习教程(含详细示例、代码、预期输出)
  • Python 中实现并发的主要方式是 threading(多线程)和 multiprocessing(多进程)。本教程从基础到进阶,结合实际示例讲解。

 背景

1. 并发基础与 GIL(全局解释器锁)

为什么需要并发?

  • I/O 密集型任务(如网络请求、文件读写):等待时间长,使用并发可显著提升效率。
  • CPU 密集型任务(如计算、图像处理):需要真正并行执行。

GIL(Global Interpreter Lock):

  • CPython(标准 Python 实现)中有一个全局锁,只允许一个线程同时执行 Python 字节码。
  • 这意味着多线程无法利用多核 CPU 进行真正的并行计算(CPU-bound 任务受限)。
  • 但 I/O 操作、C 扩展(如 NumPy、Pandas 部分操作)会释放 GIL,因此多线程在 I/O 密集型任务中依然高效。

结论:

  • I/O 密集 → 优先用 多线程(轻量、共享内存容易)。
  • CPU 密集 → 优先用 多进程(绕过 GIL,每个进程有独立解释器和 GIL)。

多线程适用于 I/O 密集型

  • I/O 密集型任务的特点是程序大部分时间都在等待外部资源(网络响应、磁盘读写等),此时 CPU 大部分时间是空闲的。多线程可以在一个线程等待 I/O 时,让其他线程继续执行,从而大幅提升并发效率。
from concurrent.futures import ThreadPoolExecutor, as_completedimport requestsfrom tqdm import tqdmimport timedeffetch(url):    resp = requests.get(url, timeout=10)return url, resp.status_codeurls = ["https://httpbin.org/delay/1","https://httpbin.org/delay/2","https://httpbin.org/delay/1.5","https://httpbin.org/delay/3"] * 2

1. 单线程访问网址,并使用tqdm记录进度

defsingle_thread(urls):    start = time.time()for url in tqdm(urls, total=len(urls),desc="进度"):        url, code = fetch(url)# code = fetch(url)[1]# print(f"{url} 返回状态码: {code}")    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍single_thread(urls)# 进度: 100%|██████████| 8/8 [00:25<00:00,  3.21s/it]# 总耗时: 25.68 秒

2. 多线程方法一:(使用ThreadPoolExecutor:submit() method + as_completed() + tqdm())

defmulti_thread_submit(urls):"""    using submit() method + as_completed() + tqdm()    """    start = time.time()with ThreadPoolExecutor(max_workers=20as executor:        futures = [executor.submit(fetch, url) for url in urls]for future in tqdm(as_completed(futures), total=len(futures), desc="进度"):              url, code = future.result()# print(f"{url} 返回状态码: {code}")    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍multi_thread_submit(urls)# 进度: 100%|██████████| 8/8 [00:04<00:00,  1.80it/s]# 总耗时: 4.46 秒

3.多线程方法二:(使用ThreadPoolExecutor:map())

defmulti_thread_map(urls):"""    using map() method    """    start = time.time()with ThreadPoolExecutor(max_workers=20as executor:        results = list(executor.map(fetch, urls)) # 如果需要传入两个参数,可以借鉴zip()函数,# 如:results = list(executor.map(fetch, zip(urls, range(len(urls)))))for (url, code) in results:# print(f"{url} 返回状态码: {code}")pass    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍multi_thread_map(urls)# 总耗时: 4.12 秒

多进程适用于 CPU 密集型

  • CPU 密集型任务的特点是大量时间用于纯计算,需要真正利用多核 CPU。多进程能绕过 GIL,每个进程独立运行在不同 CPU 核心上,实现真正并行。
from concurrent.futures import ProcessPoolExecutor, as_completedfrom multiprocessing.pool import Poolimport requestsfrom tqdm import tqdmimport timedeffetch(url):    resp = requests.get(url, timeout=10)return url, resp.status_codeurls = ["https://httpbin.org/delay/1","https://httpbin.org/delay/2","https://httpbin.org/delay/1.5","https://httpbin.org/delay/3"] * 2

1. 单进程访问网址,并使用tqdm记录进度

defsingle_process(urls):    start = time.time()for url in tqdm(urls, total=len(urls),desc="进度"):        url, code = fetch(url)# code = fetch(url)[1]# print(f"{url} 返回状态码: {code}")    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍single_process(urls)# 进度: 100%|██████████| 8/8 [00:25<00:00,  3.21s/it]# 总耗时: 25.68 秒

2. 多线程方法一:(使用pool.apply_async)

defmulti_process_pool(urls):"""    using Pool() method    """    start = time.time()    pool = Pool(processes=20)    results = []for url in urls:        results.append(pool.apply_async(fetch, args=(url,)))    pool.close()    pool.join()for result in results:        url, code = result.get()# print(f"{url} 返回状态码: {code}")    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍multi_process_pool(urls)# 总耗时: 4.68 秒

3. 多线程方法二:(使用ProcessPoolExecutor:submit() method + as_completed() + tqdm())

defmulti_process_submit(urls):"""    using submit() method + as_completed() + tqdm()    """    start = time.time()with ProcessPoolExecutor(max_workers=20as executor:        futures = [executor.submit(fetch, url) for url in urls]for future in tqdm(as_completed(futures), total=len(futures), desc="进度"):              url, code = future.result()# print(f"{url} 返回状态码: {code}")    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍multi_process_submit(urls)# 进度: 100%|██████████| 8/8 [00:04<00:00,  1.80it/s]# 总耗时: 4.46 秒

4. 多线程方法三:(使用ProcessPoolExecutor:map())

defmulti_process_map(urls):"""    using map() method    """    start = time.time()with ProcessPoolExecutor(max_workers=20as executor:        results = list(executor.map(fetch, urls)) # 如果需要传入两个参数,可以借鉴zip()函数,# 如:results = list(executor.map(fetch, zip(urls, range(len(urls)))))for (url, code) in results:# print(f"{url} 返回状态码: {code}")pass    print(f"总耗时: {time.time()-start:.2f} 秒")   # 通常比单线程快数倍multi_process_map(urls)# 总耗时: 4.12 秒

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  1. CONNECT:[ UseTime:0.000657s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000815s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000342s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000300s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 493778 LIMIT 1 [ RunTime:0.000464s ]
  9. UPDATE `article` SET `lasttime` = 1783053265 WHERE `id` = 493778 [ RunTime:0.006235s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000269s ]
  11. SELECT * FROM `article` WHERE `id` < 493778 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000419s ]
  12. SELECT * FROM `article` WHERE `id` > 493778 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003956s ]
  13. SELECT * FROM `article` WHERE `id` < 493778 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008384s ]
  14. SELECT * FROM `article` WHERE `id` < 493778 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000992s ]
  15. SELECT * FROM `article` WHERE `id` < 493778 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003616s ]
0.096946s