The steps are shown in the image linked here:
https://i.stack.imgur.com/Hx5tf.png
Go to debug mode in VS Code
Click on the settings icon (gear icon). If it does not exist this will create a launch.json
In the json, in any of the configuration, add the args json parameter:
{
"name": "Python: Terminal (integrated)",
"type": "python",
"request": "launch",
"stopOnEntry": true,
"pythonPath": "${config:python.pythonPath}",
"program": "${file}",
"cwd": "",
"console": "integratedTerminal",
"env": {},
"args": [
"input2.csv",
"output2.csv"
],
"envFile": "${workspaceFolder}/.env",
"debugOptions": [],
"internalConsoleOptions": "neverOpen"
}