fix(tidy3d_extras): fix error message in tidy3d_extras importing

[weiliangjin2021]

Greptile Overview

Greptile Summary

This PR improves error messaging in the tidy3d_extras import checking function by:

• Escaping square brackets in shell command examples (pip install tidy3d\[extras]) to prevent them from being interpreted as glob patterns in some shells
• Adding a check for __version__ attribute existence before attempting to access it, providing a clearer error message when the package didn't initialize properly

Issue Found:

• Missing space after period in error message on line 215

Confidence Score: 4/5

• This PR is safe to merge with one minor formatting fix needed
• The changes are straightforward improvements to error messages. The escaped square brackets fix a real issue where shells could interpret the brackets as globs. The added __version__ check provides better error handling. One syntax issue (missing space) needs correction before merging.
• tidy3d/packaging.py needs a minor spacing fix on line 215

Important Files Changed

File Analysis

Filename	Score	Overview
tidy3d/packaging.py	4/5	Escapes square brackets in error messages and adds __version__ check; missing space after period on line 215

Sequence Diagram

sequenceDiagram
    participant User
    participant Function as _check_tidy3d_extras_available()
    participant ImportSystem as Import System
    participant Module as tidy3d_extras module

    User->>Function: Call function requiring tidy3d_extras
    Function->>Function: Check if already loaded (tidy3d_extras["mod"])
    alt Already loaded
        Function-->>User: Return (skip checks)
    end
    
    Function->>ImportSystem: find_spec("tidy3d_extras")
    alt Module not found
        ImportSystem-->>Function: None
        Function->>User: Raise error with escaped brackets
    end
    
    Function->>Module: import tidy3d_extras
    alt Import fails
        Module-->>Function: ImportError
        Function->>User: Raise Tidy3dImportError
    end
    
    Function->>Module: Check hasattr(__version__)
    alt __version__ missing (NEW CHECK)
        Module-->>Function: False
        Function->>User: Raise error with install instructions
    end
    
    Function->>Module: Get __version__
    alt version is None
        Module-->>Function: None
        Function->>User: Raise error (invalid API key)
    end
    
    alt version mismatch
        Function->>User: Raise error with version info
    end
    
    Function->>Function: Store module reference
    Function-->>User: Success

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Diff Coverage

Diff: origin/develop...HEAD, staged and unstaged changes

• tidy3d/packaging.py (0.0%): Missing lines 213-214

Summary

• Total: 2 lines
• Missing: 2 lines
• Coverage: 0%

tidy3d/packaging.py

Lines 209-218

  209         raise Tidy3dImportError(
  210             "The package 'tidy3d-extras' did not initialize correctly."
  211         ) from exc
  212 
! 213     if not hasattr(tidy3d_extras_mod, "__version__"):
! 214         raise Tidy3dImportError(
  215             "The package 'tidy3d-extras' did not initialize correctly. "
  216             "Please install the 'tidy3d-extras' package using, for "
  217             r"example, 'pip install tidy3d\[extras]'."
  218         )

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