Some packages are not detected for autoImport functionality

[AlsonYang]

Environment data

• Pylance version: Pylance language server 2024.8.1 (pyright version 1.1.373, commit ee424479)
• OS and version: Apple M1 Pro MacOS 15.2 (24C101)
• Python version (& distribution if applicable, e.g. Anaconda): python=3.11. langgraph="0.2.73"

Code Snippet

langgraph

Repro Steps

Type the above comment with this setting "python.analysis.autoImportCompletions": true,.

Expected behavior

I would expect to see langgraph auto import pops up while typing the above codes.

Actual behavior

When I type langgraph, langgraph is not shown on the list, but langgraph_cli and langgraph sdk showed.
I have both langgraph and pydantic installed and have the env activated. The auto import works for pydantic, but not langgraph

Logs

XXX

[debonte]

@heejaechang would know better than me, but I think this may be intentional given that langgraph doesn't have an __init__.py. It contains a bunch of submodules, but to use those you would need to explicitly import them (ex. import langgraph.channels).

Put another way, how are you intending to use the langgraph symbol after importing it? Maybe a more complete code sample would help us here.

[AlsonYang]

@debonte Thanks for the chasing this up.

I don't use the langgraph symbol directly, but the submodule that it contains. Anything that relates to the LangGraph package is not detected. The reason I had langgraph in the issue body is because even the main module is not detected.

This is the way that LangGraph is normally used

from langgraph.graph import StateGraph
graph_builder = StateGraph()

Issue: When I type StateGraph, the auto import doesn't pop up, so I would need to manually add in the import line myself.

Same issue with the LangChain package with the below usage

from langchain_core.messages import HumanMessage
HumanMessage(content="Hello, world!")

[PabloLION]

Same here. I want to auto-import some symbol from the package I'm writing, but pylance stopped doing that a while ago. and I tried to modify these settings python.analysis.userFileIndexingLimit, "python.analysis.userFileIndexingLimit": -1,, Added my package to python.analysis.packageIndexDepths, with "includeAllSymbols": true, "python.analysis.showOnlyDirectDependenciesInAutoImport": true, adding the package into "python.autoComplete.extraPaths"

And I have the workspace settings like this (my package name is line_length_lint):

  "python.analysis.extraPaths": ["line_length_lint/**"],
  "python.autoComplete.extraPaths": ["line_length_lint/**"],
  "python.analysis.packageIndexDepths": [
    {
      "name": "line_length_lint",
      "depth": 100,
      "includeAllSymbols": true
    }
  ],
  "python.analysis.userFileIndexingLimit": -1

And my user setting is like this

  "python.analysis.autoFormatStrings": true,
  "python.analysis.autoImportCompletions": true,
  "python.analysis.completeFunctionParens": true,
  "python.analysis.diagnosticMode": "workspace",
  "python.analysis.enableExperimentalServer": false,
  "python.analysis.exclude": [
    "dist",
    "**/site-packages/**", // Exclude installed packages
    "**/venv/**", // Exclude virtual environments
    "**/.venv/**", // Exclude virtual envs with .venv naming
    "**/__pycache__/**", // Exclude Python cache files
    "**/.git/**", // Exclude Git repository files
    "**/.vscode/**" // Exclude VS Code workspace settings
  ],
  "python.analysis.extraCommitChars": true,
  "python.analysis.fixAll": [
    "source.convertImportFormat",
    "source.unusedImports"
  ],
  "python.analysis.generateWithTypeAnnotation": true,
  "python.analysis.indexing": true,
  "python.analysis.inlayHints.callArgumentNames": "all",
  "python.analysis.inlayHints.functionReturnTypes": true,
  "python.analysis.inlayHints.pytestParameters": true,
  "python.analysis.inlayHints.variableTypes": true,
  "python.analysis.languageServerMode": "full",
  "python.analysis.logLevel": "Trace",
  "python.analysis.packageIndexDepths": [
    {
      "depth": 0,
      "name": "ctypes"
    },
    {
      "depth": 0,
      "name": "ast"
    },
    {
      "depth": 2,
      "name": "sklearn"
    },
    {
      "depth": 2,
      "name": "matplotlib"
    },
    {
      "depth": 2,
      "name": "scipy"
    },
    {
      "depth": 2,
      "name": "django"
    },
    {
      "depth": 2,
      "name": "flask"
    },
    {
      "depth": 2,
      "name": "fastapi"
    },
    {
      "depth": 4,
      "name": "pillow"
    }
  ],
  "python.analysis.showOnlyDirectDependenciesInAutoImport": true,
  "python.analysis.supportDocstringTemplate": true,
  "python.analysis.typeCheckingMode": "strict",
  "python.analysis.typeEvaluation.deprecateTypingAliases": true,
  "python.analysis.typeEvaluation.disableBytesTypePromotions": true,
  "python.analysis.typeEvaluation.enableExperimentalFeatures": false,
  "python.analysis.typeEvaluation.enableReachabilityAnalysis": true,
  "python.analysis.typeEvaluation.strictDictionaryInference": true,
  "python.analysis.typeEvaluation.strictListInference": true,
  "python.analysis.typeEvaluation.strictSetInference": true,
  "python.analysis.userFileIndexingLimit": -1,
  "python.createEnvironment.contentButton": "show",
  "python.defaultInterpreterPath": "/usr/local/bin/python3",
  "python.languageServer": "Pylance",
  "python.testing.pytestArgs": ["tests", "-vv", "-rA", "--capture=fd"],
  "python.testing.pytestEnabled": true,

Then the auto-import function is still not detecting the symbol. However, the add import code action works (it's much harder to use than auto-import).

I also tried to bisect extensions in VSCode-insiders, yet I cannot do it with "pylance" always on. So it wasn't fruitful at all. Is there a way to fix this problem? Should I create a new issue?