How to Debug Python with VS Code

Summary

• Basic
• Spec
• Instruction
• unit test
• executable file debug

Basic

• Python.org
• Extension: Python ms-python.python
• Debugger: Python
• module code: bubblesort/bubblesort_logic.py

Spec

• OS
  • ✅ MacOS
  • ✅ Windows
  • ✅ Linux
• Break Point
  • ✅ break point
  • ✅ condition break point
  • ❌ function breakpoint
  • ✅ uncaught exception breakpoint
  • ✅ all exception breakpoint
• Step Execution
  • ✅ Step Over
  • ✅ Step Into
  • ✅ Step Out
  • ✅ Continue
• Variables
  • ✅ variables views
  • ✅ watch variables
• Call Stack
  • ✅ call stack
• Evaluation
  • ✅ eval expression to show variables
  • ✅ eval expression to change variables
• Type of Execution
  • ✅ debug unit test
  • ✅ debug executable package
  • ✅ remote debugging

Instruction

Only installing Extension.

additional

If you want to pyenv or other environment tools, select your environment with belong way.

F1->Python: Select Workspace Interpreter

unit test

• test code: bubblesort/test/test_bubblesort.py

inline

F1->Python: Run Current Unit Test File

Enable and configure a Test Framework.->select your test framework.

sample: unittest->.->test_*

Codelens on test function shows run and debug test button.

But it sometimes doesn’t start debug in my machine. Then, it restarts VS Code and retry.

use launch.json

Menu: Python:Python module

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Python Module",
      "type": "python",
      "request": "launch",
      "module": "unittest",
      "args": [
        // test package
        // <test_file>
        // <test_file>.<test_class>
        // <test_file>.<test_class>.<test_method>
        "bubblesort.test.test_bubblesort"
      ]
    }
  ]
}

executable file debug

executable file: main.py

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Python",
      "type": "python",
      "request": "launch",
      "program": "${workspaceFolder}/main.py",
      "args": ["4", "3", "2", "1"]
    }
  ]
}

execute module debug

module : bubblesort

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Python",
      "type": "python",
      "request": "launch",
      "module": "bubblesort",
      "args": ["4", "3", "2", "1"]
    }
  ]
}

remote debug

prepare

install pyvsd package

pip install ptvsd

code

add remote debug code.

import ptvsd

ptvsd.enable_attach("nnyn", address=('0.0.0.0', 3333))
ptvsd.wait_for_attach()

run follow command.

python bubble_sorter_for_remote.py 4 3 2 1

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Attach (Remote Debug)",
      "type": "python",
      "request": "attach",
      "pathMappings": [
        {
          "localRoot": "${workspaceFolder}",
          "remoteRoot": "/home/nnyn/vscode-debug-specs/python"
        }
      ],
      "port": 3333,
      "host": "127.0.0.1"
    }
  ]
}