fix pylint

[dt-yy]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.
fix pylint

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
llm_web_kit/simple.py	42.85%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (42.85%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

@@            Coverage Diff             @@
##              dev     #463      +/-   ##
==========================================
- Coverage   89.97%   89.74%   -0.23%     
==========================================
  Files         107      102       -5     
  Lines        8288     8467     +179     
==========================================
+ Hits         7457     7599     +142     
- Misses        831      868      +37     

Files with missing lines	Coverage Δ
llm_web_kit/simple.py	81.48% <42.85%> (-15.58%)	⬇️

... and 7 files with indirect coverage changes

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