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Python 异步调试神器:必须掌握的 3 个核心工具

  • 2026-02-09 20:47:29
Python 异步调试神器:必须掌握的 3 个核心工具
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Python 异步调试神器:必须掌握的 3 个核心工具

在 Python 中调试异步代码感觉就像解决一个拼图,其中各个部分不断移动, 非阻塞特性对性能非常有用,但会带来争用条件、死锁和未处理的异常等挑战。多年来,我一直依赖三个关键工具来使调试异步 Python 代码变得易于管理, 在本文中,我将分享这些工具如何帮助你有效调试并节省大量时间的实际示例.

1. 用于跟踪异步 bug

如你曾经调试过 Python 代码,则可能使用过 Python 的内置调试器,虽然它不是为异步工作流量身定制的,但它仍然是检查变量和单步调试代码的可靠工具.

一个难以发现的错误

这是一个简单的异步程序,但有一个容易错过的错误:

import asyncioasyncdeffetch_data():  print("Fetching data...")  await asyncio.sleep(1)  print("Data fetched.")asyncdefmain():      fetch_data()  # Forgot `await`!  print("Task completed.")asyncio.run(main())

问题是什么?程序完成且没有错误,但不会运行,发生这种情况是因为 was called but not awaited,因此它没有执行。

pdb调试方式

使用pdb捕获问题

import pdbasyncdefmain():      pdb.set_trace()  # Add breakpoint      fetch_data()  # Missing `await`  print("Task completed.")asyncio.run(main())

运行脚本,当它暂停时:

  1. 1. 使用命令单步执行代码
  2. 2. 键入以检查其值,你将看到它是一个协程对象,而不是结果

发现问题后,通过添加 :await

asyncdefmain():  await fetch_data()  print("Task completed.")asyncio.run(main())

pdb非常适合捕获像这样的简单错误,但对于更复杂的问题,我们需要专门的工具。

2.用于实时事件循环调试aiomonitor

当异步错误感觉像是隐藏在阴影中时 , 任务以无法重现的方式冻结或重叠 , 可以挽救局面,它允许实时检查事件循环,显示活动任务及其状态.

调用卡主的任务

下面是一个程序,其中两个任务同时运行,但一个任务偶尔会冻结:

import asyncioasyncdefworker(name):  for i inrange(3):  print(f"{name}{i}")  await asyncio.sleep(1)asyncdefmain():      task1 = asyncio.create_task(worker("Task1"))      task2 = asyncio.create_task(worker("Task2"))  await asyncio.gather(task1, task2)asyncio.run(main())

当其中一名work停止打印时,就该引入 aiomonitor

调试方式

安装aiomonitor

pip install aiomonitor

修改代码以包含监视器:

asyncdefmain():  with aiomonitor.start_monitor():          task1 = asyncio.create_task(worker("Task1"))          task2 = asyncio.create_task(worker("Task2"))  await asyncio.gather(task1, task2)asyncio.run(main())

运行程序并使用 Telnet 连接到监视器:

telnet localhost 50101

在 REPL 中,键入 to view all running tasks,用于检查特定任务并确定为什么可能卡住或等待。

aiomonitor当你需要实时了解事件循环和正在运行的任务时,它会大放异彩。

3. 用于防止bug

调试只是成功的一半,处理异步 bug 的最好方法是防止它们,这就是它的用武之地,它是一个专为异步 Python 代码构建的测试库,可以轻松模拟协程和编写测试用例。

测试争用条件

这是一个典型的争用条件错误:

import asynciocounter = 0asyncdefincrement():  global counter    temp = counter  await asyncio.sleep(0.1)  # Simulate delay    counter = temp + 1asyncdefmain():  await asyncio.gather(increment(), increment())asyncio.run(main())

编写asynctest

安装 asynctest

pip install asynctest

编写一个测试用例来公开争用条件:

import asynctestclassTestRaceCondition(asynctest.TestCase):  asyncdeftest_race_condition(self):  global counter        counter = 0asyncdefincrement():  global counter            temp = counter  await asyncio.sleep(0.1)            counter = temp + 1await asyncio.gather(increment(), increment())self.assertEqual(counter, 2)  # 这里会失败

解决问题

添加锁以防止重叠增量:

lock = asyncio.Lock()asyncdefincrement():  global counter  asyncwith lock:        temp = counter  await asyncio.sleep(0.1)        counter = temp + 1

再次运行测试,它将通过。

结论

调试异步 Python 代码不一定是一场噩梦。使用正确的工具:

  1. 1. pdb 可帮助你跟踪一些简单的问题,例如未等待的协程。
  2. 2. aioMonitor 让你实时了解正在运行的任务和事件循环。
  3. 3. asynctest 确保在 bug 进入生产环境之前捕获并修复它们。

这些工具中的每一个都为我在处理异步项目时节省了无数的时间,也为我节省了相当多的麻烦,希望他们也会为你省下调试时间和解决麻烦,祝调试愉快!

原文: https://www.tk1s.com/python/3-essential-tools-you-must-learn-for-debugging-async-code-in-python

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  1. CONNECT:[ UseTime:0.000758s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000936s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000451s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000517s ]
  6. SELECT * FROM `set` [ RunTime:0.000245s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000584s ]
  8. SELECT * FROM `article` WHERE `id` = 474630 LIMIT 1 [ RunTime:0.000763s ]
  9. UPDATE `article` SET `lasttime` = 1770652886 WHERE `id` = 474630 [ RunTime:0.007399s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000242s ]
  11. SELECT * FROM `article` WHERE `id` < 474630 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `article` WHERE `id` > 474630 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000372s ]
  13. SELECT * FROM `article` WHERE `id` < 474630 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000786s ]
  14. SELECT * FROM `article` WHERE `id` < 474630 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000988s ]
  15. SELECT * FROM `article` WHERE `id` < 474630 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000953s ]
0.153026s