How to setup Visual Studio Code stdin/stdout redirection for Python (debugger)?

Question

I am using Visual Studio Code to debug my Python code.

I want to redirect one text file in stdin and the output be written in another file.

I can reach that by running python directly using the following syntax:

python code.py < input.txt > output.txt

Is there a way to allow that while debugging the script? If that is not possible, can I create a configuration for running python with that parameters. I tried using args parameter in the launch.json, but those are all placed into quotes that defeats the purpose of this redirection.

Volker Voecking · Accepted Answer · 2020-05-12 15:20:18Z

24

I was able to achieve this using the args parameter in the launch.json config file:

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387

    "version": "0.2.0",
    "configurations": [
        {
            "name": "Python: Aktuelle Datei",
            "type": "python",
            "request": "launch",
            "program": "${file}",
            "console": "integratedTerminal",
            "args": [ "<", "input.txt",
                 ">", "output.txt" ]
        }
    ]
}

When running the debugger you get the following command line:

bash-3.2$  env DEBUGPY_LAUNCHER_PORT=51669 /usr/local/opt/python/bin/python3.7 /Users/XXXX/.vscode/extensions/ms-python.python-2020.4.76186/pythonFiles/lib/python/debugpy/wheels/debugpy/launcher "/Users/XXXX/my_script.py" < input.txt > output.txt

Visual Studio Code 1.45
macOS 10.14.6

answered May 12, 2020 at 15:20

Volker Voecking

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3 Comments

Melted Away Over a year ago

Setting "console": "integratedTerminal" while redirecting the standard input throws an error: Error processing 'configurationDone' request. The handle is invalid. console property should be set to something like internalConsole.

olpchk Over a year ago

Got the error: "The '<' operator is reserved for future use." vscode 1.69.2, windows

Rodney Over a year ago

You wouldn't expect this to work because the redirection operator is not a program argument. However, VSCode 1.71 on Ubuntu this did actually work for me. Using C++

Brett Cannon · Accepted Answer · 2019-11-27 23:28:14Z

3

There isn't any built-in solution, but if you modified your app to replace sys.stdin and sys.stdout with what you would like to be considered stdin and stdout you could get the same effect.

answered Nov 27, 2019 at 23:28

Brett Cannon

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Comments

Shore · Accepted Answer · 2024-07-11 02:28:50Z

1

Hi this seems work for me:

        {
            "name": "Python: 01-vector-add",
            "type": "debugpy",
            "request": "launch",
            "program": "${workspaceFolder}/triton-project/python/tutorials/01-vector-add.py",
            "console": "integratedTerminal",
            "justMyCode": false,
            "env": {
                "MLIR_ENABLE_DUMP": "1",
                "LLVM_IR_ENABLE_DUMP": "1",
                "TRITON_ENABLE_LLVM_DEBUG": "1",
                "TRITON_CACHE_DIR" : "${workspaceFolder}/.cache"
            },
            "args": "1>${workspaceFolder}/01-vector-add.ll 2>&1"
        }

answered Jul 11, 2024 at 2:28

Shore

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