Atomizer/docs/NXOPEN_INTELLISENSE_SETUP.md

NXOpen Python Intellisense Setup

Status: ✅ Implemented (2025-11-17)

Enable intelligent code completion for NXOpen Python API using Siemens-provided stub files

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Overview

Siemens NX 2412 includes Python stub files (.pyi) that provide full type hints for the NXOpen API. These enable:

• Autocomplete: Suggestions for classes, methods, and properties
• Type Hints: Parameter types and return values
• Documentation: Inline docstrings and API descriptions
• Error Detection: Type checking catches errors before runtime

This dramatically improves development speed and reduces NXOpen API lookup time.

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Prerequisites

• Siemens NX 2412 (or later) installed with Programming Tools
• VSCode with Pylance extension (usually installed with Python extension)
• Python 3.10+ environment

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Setup Instructions

Step 1: Verify Stub Files Exist

Check that stub files are installed:

# Windows path:
dir "C:\Program Files\Siemens\Simcenter3D_2412\ugopen\pythonStubs\NXOpen"

# Should show: __init__.pyi and many module folders (CAE, Assemblies, etc.)

If missing: Reinstall NX 2412 and ensure "Programming Tools" is checked during installation.

Step 2: Configure VSCode

Update .vscode/settings.json in your Atomizer project:

{
    "python.analysis.typeCheckingMode": "basic",
    "python.analysis.stubPath": "C:\\Program Files\\Siemens\\Simcenter3D_2412\\ugopen\\pythonStubs"
}

Note: Use double backslashes (\\) in Windows paths for JSON.

Step 3: Restart VSCode

Close and reopen VSCode to load the new stub files.

Step 4: Verify Intellisense Works

Open tests/test_nxopen_intellisense.py and verify:

1. Import Autocomplete:

   • Type import NXOpen. → Should suggest: Part, Session, CAE, Assemblies, etc.

2. Method Autocomplete:

   • Type session. → Should suggest: GetSession(), Parts, etc.
   • Type expressions. → Should suggest: FindObject, CreateExpression, etc.

3. Parameter Hints:

   • Hover over CreateExpression() → Shows parameter types and documentation

4. Documentation Tooltips:

   • Hover over any NXOpen class/method → Shows docstring

If working: ✅ Intellisense is configured correctly!

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What You Get

Before Intellisense:

import NXOpen
session = NXOpen.Session.GetSession()
# ❌ No suggestions when typing "session."
# ❌ No parameter hints for methods
# ❌ Must look up API in documentation

After Intellisense:

import NXOpen
session = NXOpen.Session.GetSession()
# ✅ Type "session." → See: Parts, ListingWindow, LogFile, etc.
# ✅ Type "session.Parts." → See: Work, Display, FindObject, etc.
# ✅ Hover over methods → See parameter types and documentation
# ✅ Catch type errors before running code

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Available Modules

The stub files cover all NXOpen modules:

Core Modules:

• NXOpen.Session - NX session management
• NXOpen.Part - Part objects and operations
• NXOpen.Assemblies - Assembly operations

CAE Modules:

• NXOpen.CAE - Finite element analysis
• NXOpen.CAE.FemPart - FEM models
• NXOpen.CAE.SimSolution - Solutions and solver control

Design Modules:

• NXOpen.Features - Parametric features
• NXOpen.Sketches - Sketch operations
• NXOpen.Modeling - Modeling operations

And many more: Drafting, Display, Motion, Optimization, etc.

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Example: Using Intellisense During Development

Scenario: Update Part Expression

Without Intellisense (manual lookup required):

# 1. Google: "NXOpen get expression"
# 2. Find documentation
# 3. Copy method signature
# 4. Hope you got it right
work_part.Expressions.FindObject("tip_thickness")

With Intellisense (guided development):

# 1. Type "work_part.Exp" → Autocomplete suggests "Expressions"
# 2. Type "work_part.Expressions." → See all methods
# 3. Select "FindObject" → See parameter types
# 4. Hover for documentation
work_part.Expressions.FindObject("tip_thickness")  # ✅ Correct!

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Benefits for Atomizer Development

1. Faster Development

• No context switching to documentation
• Discover APIs as you type
• Reduce typos and API misuse

2. Better Code Quality

• Type checking catches errors early
• Method signatures documented inline
• Parameter validation before runtime

3. LLM-Assisted Coding

When using Claude Code to develop Atomizer:

• Claude can "see" NXOpen API structure via stub files
• Better code generation suggestions
• Reduced hallucination of API methods

4. Onboarding

• New contributors learn NXOpen API faster
• Inline documentation reduces learning curve
• Explore API without leaving IDE

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Integration with Atomizer Workflow

Journal Script Development

When writing NX journal scripts (optimization_engine/solve_simulation.py):

import NXOpen

theSession = NXOpen.Session.GetSession()
workPart = theSession.Parts.Work

# Intellisense shows:
# - workPart.Expressions.FindObject(...)
# - workPart.Expressions.EditWithUnits(...)
# - workPart.Update()
# - workPart.Save(...)

LLM Code Generation

When LLM generates NXOpen code, stub files help:

• Validate generated code against actual API
• Suggest corrections for API misuse
• Provide parameter type hints

Future: NXOpen Documentation Integration

This is Step 1 of NXOpen integration. Future work:

1. ✅ Stub files for intellisense (current)
2. 🔜 Documentation scraping for LLM knowledge base
3. 🔜 Authenticated docs access for latest API references
4. 🔜 LLM-generated journal scripts with validation

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Troubleshooting

Intellisense Not Working

Problem: No autocomplete suggestions appear

Solutions:

1. Check Pylance Extension: VSCode → Extensions → Search "Pylance" → Ensure installed
2. Verify Settings: .vscode/settings.json has correct stub path
3. Check Python Interpreter: VSCode bottom-left → Select correct Python environment
4. Restart VSCode: Close all windows and reopen
5. Check Stub Path: Ensure path exists and contains NXOpen folder

Wrong Suggestions

Problem: Autocomplete shows incorrect or outdated methods

Solution: Ensure stub files match your NX version:

• NX 2412 → Use Simcenter3D_2412\ugopen\pythonStubs
• Different NX version → Update stub path in settings

Type Errors Shown

Problem: Pylance shows type errors for valid code

Solutions:

1. Set "python.analysis.typeCheckingMode": "basic" (not "strict")
2. Add # type: ignore for false positives
3. Update stub files if using newer NX version

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References

• Siemens NX Documentation: PLM Portal
• TheScriptingEngineer: Blog with NXOpen examples
• Pylance Documentation: VSCode Python

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Next Steps

Now that intellisense is configured:

1. Try It: Open tests/test_nxopen_intellisense.py and explore
2. Develop Faster: Use autocomplete when writing journal scripts
3. Contribute: Help improve Atomizer's NXOpen integration

See: DEVELOPMENT_GUIDANCE.md for strategic roadmap including NXOpen documentation access.

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Implemented By: Antoine Letarte Date: 2025-11-17 NX Version: 2412 Status: Production Ready