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[BUG]: PythonScript@0 doesn't seem to get SIGINIT/SIGTERM #19390

Closed
4 of 7 tasks
nkr0 opened this issue Dec 18, 2023 · 5 comments
Closed
4 of 7 tasks

[BUG]: PythonScript@0 doesn't seem to get SIGINIT/SIGTERM #19390

nkr0 opened this issue Dec 18, 2023 · 5 comments
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@ivanduplenskikh
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Area: ABTT Akvelon Build Tasks Team area of work bug

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@nkr0
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nkr0 commented Dec 18, 2023 •
edited
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New issue checklist

Task name

PythonScript

Task version

0.231.0

Issue Description

This page says that SIGINT or SIGTERM is sent on job cancellation. Below is a simplified task calling testSigint.py.

          - task: PythonScript@0
            displayName: 'Build'
            inputs:
              scriptSource: 'filePath'
              scriptPath: '/home/vmuser/testSigint.py'
              pythonInterpreter: '/usr/bin/python3'
import signal, sys, time

def cancelJob(signum, frame):
    for i in range(1000):
        print(i, signal.Signals(signum).name)
    time.sleep(10)
    sys.exit(1)

signal.signal(signal.SIGABRT, cancelJob)
signal.signal(signal.SIGHUP, cancelJob)
signal.signal(signal.SIGINT, cancelJob)
signal.signal(signal.SIGQUIT, cancelJob)
signal.signal(signal.SIGTERM, cancelJob)

for i in range(1000):
    print(i, "job started")
time.sleep(600)

But the logs show that cancelJob was not called, suggesting that the process was not ended with any of the signals I tried. Running the script locally and pressing Ctrl+C triggers SIGINT and is caught as expected.

Issue #16731 is similar in that SIGINT from the agent becomes SIGTERM by the time it reached the child process. But here it's none of those.

Environment type (Please select at least one enviroment where you face this issue)

  • Self-Hosted
  • Microsoft Hosted
  • VMSS Pool
  • Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Ubuntu 22.04

Relevant log output

2023-12-18T20:56:30.9556798Z ##[debug]Evaluating condition for step: 'Build'
2023-12-18T20:56:30.9564426Z ##[debug]Evaluating: SucceededNode()
2023-12-18T20:56:30.9564695Z ##[debug]Evaluating SucceededNode:
2023-12-18T20:56:30.9580087Z ##[debug]=> True
2023-12-18T20:56:30.9586644Z ##[debug]Result: True
2023-12-18T20:56:30.9659765Z ##[section]Starting: Build
2023-12-18T20:56:30.9870649Z ==============================================================================
2023-12-18T20:56:30.9871364Z Task         : Python script
2023-12-18T20:56:30.9871686Z Description  : Run a Python file or inline script
2023-12-18T20:56:30.9871805Z Version      : 0.231.0
2023-12-18T20:56:30.9872037Z Author       : Microsoft Corporation
2023-12-18T20:56:30.9872281Z Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/python-script
2023-12-18T20:56:30.9872434Z ==============================================================================
2023-12-18T20:56:31.1018667Z ##[debug]Using node path: /home/vmuser/agents/agent1/externals/node16/bin/node
2023-12-18T20:56:31.2149594Z ##[debug]agent.TempDirectory=/home/vmuser/agents/agent1/_work/_temp
2023-12-18T20:56:31.2150430Z ##[debug]loading inputs and endpoints
2023-12-18T20:56:31.2150861Z ##[debug]loading INPUT_SCRIPTSOURCE
2023-12-18T20:56:31.2151413Z ##[debug]loading INPUT_SCRIPTPATH
2023-12-18T20:56:31.2151831Z ##[debug]loading INPUT_PYTHONINTERPRETER
2023-12-18T20:56:31.2152247Z ##[debug]loading INPUT_WORKINGDIRECTORY
2023-12-18T20:56:31.2152643Z ##[debug]loading INPUT_FAILONSTDERR
2023-12-18T20:56:31.2153089Z ##[debug]loading ENDPOINT_AUTH_SYSTEMVSSCONNECTION
2023-12-18T20:56:31.2153539Z ##[debug]loading ENDPOINT_AUTH_SCHEME_SYSTEMVSSCONNECTION
2023-12-18T20:56:31.2154011Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_SYSTEMVSSCONNECTION_ACCESSTOKEN
2023-12-18T20:56:31.2154460Z ##[debug]loading SECRET_JENKINS_TOKEN
2023-12-18T20:56:31.2154860Z ##[debug]loading SECRET_SYSTEM_ACCESSTOKEN
2023-12-18T20:56:31.2155280Z ##[debug]loaded 10
2023-12-18T20:56:31.2155666Z ##[debug]Agent.ProxyUrl=undefined
2023-12-18T20:56:31.2156072Z ##[debug]Agent.CAInfo=undefined
2023-12-18T20:56:31.2156470Z ##[debug]Agent.ClientCert=undefined
2023-12-18T20:56:31.2156870Z ##[debug]Agent.SkipCertValidation=undefined
2023-12-18T20:56:31.2157377Z ##[debug]check path : /home/vmuser/agents/agent1/_work/_tasks/PythonScript_6392f95f-7e76-4a18-b3c7-7f078d2f7700/0.231.0/task.json
2023-12-18T20:56:31.2157974Z ##[debug]adding resource file: /home/vmuser/agents/agent1/_work/_tasks/PythonScript_6392f95f-7e76-4a18-b3c7-7f078d2f7700/0.231.0/task.json
2023-12-18T20:56:31.2158477Z ##[debug]system.culture=en-US
2023-12-18T20:56:31.2158899Z ##[debug]scriptSource=filePath
2023-12-18T20:56:31.2159307Z ##[debug]scriptPath=/home/vmuser/testSigint.py
2023-12-18T20:56:31.2159696Z ##[debug]script=undefined
2023-12-18T20:56:31.2160088Z ##[debug]arguments=undefined
2023-12-18T20:56:31.2160490Z ##[debug]pythonInterpreter=/usr/bin/python3
2023-12-18T20:56:31.2160952Z ##[debug]workingDirectory=/home/vmuser/agents/agent1/_work/4/s
2023-12-18T20:56:31.2163098Z ##[debug]failOnStderr=false
2023-12-18T20:56:31.2172601Z ##[debug]which '/usr/bin/python3'
2023-12-18T20:56:31.2176319Z ##[debug]found: '/usr/bin/python3'
2023-12-18T20:56:31.2177415Z ##[debug]/usr/bin/python3 arg: /home/vmuser/testSigint.py
2023-12-18T20:56:31.2180794Z ##[debug]exec tool: /usr/bin/python3
2023-12-18T20:56:31.2181214Z ##[debug]arguments:
2023-12-18T20:56:31.2181742Z ##[debug]   /home/vmuser/testSigint.py
2023-12-18T20:56:31.2184760Z [command]/usr/bin/python3 /home/vmuser/testSigint.py
2023-12-18T20:56:31.2406770Z 0 job started
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2023-12-18T20:56:43.1891510Z ##[debug]Re-evaluate condition on job cancellation for step: 'Build'.
2023-12-18T20:56:43.1954868Z 518 
2023-12-18T20:56:43.2046438Z ##[error]The operation was canceled.
2023-12-18T20:56:43.2058840Z ##[debug]System.OperationCanceledException: The operation was canceled.
   at System.Threading.CancellationToken.ThrowOperationCanceledException()
   at System.Threading.CancellationToken.ThrowIfCancellationRequested()
   at Microsoft.VisualStudio.Services.Agent.Util.ProcessInvoker.ExecuteAsync(String workingDirectory, String fileName, String arguments, IDictionary`2 environment, Boolean requireExitCodeZero, Encoding outputEncoding, Boolean killProcessOnCancel, InputQueue`1 redirectStandardIn, Boolean inheritConsoleHandler, Boolean keepStandardInOpen, Boolean highPriorityProcess, Boolean continueAfterCancelProcessTreeKillAttempt, CancellationToken cancellationToken) in /home/vsts/work/1/s/src/Agent.Sdk/ProcessInvoker.cs:line 376
   at Microsoft.VisualStudio.Services.Agent.ProcessInvokerWrapper.ExecuteAsync(String workingDirectory, String fileName, String arguments, IDictionary`2 environment, Boolean requireExitCodeZero, Encoding outputEncoding, Boolean killProcessOnCancel, InputQueue`1 redirectStandardIn, Boolean inheritConsoleHandler, Boolean keepStandardInOpen, Boolean highPriorityProcess, Boolean continueAfterCancelProcessTreeKillAttempt, CancellationToken cancellationToken) in /home/vsts/work/1/s/src/Microsoft.VisualStudio.Services.Agent/ProcessInvoker.cs:line 308
   at Microsoft.VisualStudio.Services.Agent.Worker.Handlers.DefaultStepHost.ExecuteAsync(String workingDirectory, String fileName, String arguments, IDictionary`2 environment, Boolean requireExitCodeZero, Encoding outputEncoding, Boolean killProcessOnCancel, Boolean inheritConsoleHandler, Boolean continueAfterCancelProcessTreeKillAttempt, CancellationToken cancellationToken) in /home/vsts/work/1/s/src/Agent.Worker/Handlers/StepHost.cs:line 76
   at Microsoft.VisualStudio.Services.Agent.Worker.Handlers.NodeHandler.RunAsync() in /home/vsts/work/1/s/src/Agent.Worker/Handlers/NodeHandler.cs:line 206
   at Microsoft.VisualStudio.Services.Agent.Worker.TaskRunner.RunAsync() in /home/vsts/work/1/s/src/Agent.Worker/TaskRunner.cs:line 407
   at Microsoft.VisualStudio.Services.Agent.Worker.StepsRunner.RunStepAsync(IStep step, CancellationToken jobCancellationToken) in /home/vsts/work/1/s/src/Agent.Worker/StepsRunner.cs:line 236
2023-12-18T20:56:43.2062213Z ##[section]Finishing: Build

Full task logs with system.debug enabled

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Repro steps

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@nkr0 nkr0 added the bug label Dec 18, 2023
@ivanduplenskikh
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@nkr0, can you provide additional downloadable logs?
Method CancelAndKillProcessTree should send signals and kill the process tree.
Also, you can check the output of the variable value.

@ivanduplenskikh ivanduplenskikh self-assigned this Dec 18, 2023
@nkr0
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nkr0 commented Dec 18, 2023

I'm not sure if it is safe to share downloadable logs. But I've it and if you ask for something I can share relevant info here.
grep -r "Force kill process on cancellation" returned

Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 07:14:45Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 07:18:06Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 07:53:42Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 08:55:15Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 09:07:59Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 09:11:22Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 09:15:55Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 09:18:55Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 09:23:01Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 09:30:00Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 10:54:51Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 11:09:39Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 11:17:47Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 11:39:35Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 13:03:10Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 13:27:23Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 13:29:31Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 13:31:38Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 13:57:33Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 13:59:02Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:15:54Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:17:59Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:20:37Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:27:38Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:29:34Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:31:08Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:41:38Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:53:42Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 14:56:03Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 15:03:26Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 15:06:59Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 15:14:08Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 15:19:29Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 15:27:06Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 16:01:35Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 16:40:38Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:45:59Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:46:54Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:48:33Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:50:01Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:50:47Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:55:52Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:56:29Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Worker_20231218-205629-utc.log:[2023-12-18 20:56:31Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'False'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Worker_20231218-205629-utc.log:[2023-12-18 20:56:43Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'False'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Worker_20231218-205629-utc.log:[2023-12-18 20:56:43Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'False'

Quite weird that Build 20231218.52 initiated around 2023-12-18 20:56:43 has log entries at 2023-12-18 07:14:45

@nkr0 nkr0 changed the title [BUG]: PythonScript@0 doesn't seem to get SIGINIT/SIG [BUG]: PythonScript@0 doesn't seem to get SIGINIT/SIGTERM Dec 18, 2023
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nkr0 commented Dec 18, 2023

From the timestamps, I would say that the last 4 lines are from the same run. And it looks like the agent is sending force kill, before the worker gets to try SIGINT and SIGTERM.

Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Agent_20231217-170531-utc.log:[2023-12-18 20:56:29Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'True'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Worker_20231218-205629-utc.log:[2023-12-18 20:56:31Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'False'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Worker_20231218-205629-utc.log:[2023-12-18 20:56:43Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'False'
Agent Diagnostic Logs/Build 20231218.52-JenkinsBuild/Worker_20231218-205629-utc.log:[2023-12-18 20:56:43Z INFO ProcessInvokerWrapper]   Force kill process on cancellation: 'False'

@ivanduplenskikh ivanduplenskikh added the Area: ABTT Akvelon Build Tasks Team area of work label Dec 19, 2023
@WhiteTomX WhiteTomX mentioned this issue Jul 26, 2024
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@ivanduplenskikh ivanduplenskikh mentioned this issue Aug 23, 2024
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Hi @nkr0, we've been working on a solution to ensure process signals are properly propagated and caught within our Azure Pipelines task library.
To put it simply, we've implemented a fix in the Azure Pipelines task lib to propagate signals as seen in this PR #1008 and to ensure these signals are captured in the PythonScript task, detailed here #19938.

Could you please check if this fix resolves the issue you were facing?

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@nkr0, I am closing this issue for now as I have successfully tested the behavior with catching signals in Python. If you have any further questions or problems related to this issue, please feel free to reopen it.

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