* exclude python code that auto-generated by protoc

* [CodeStyle][F401] update flake8 F401 config (unittests/npu,xpu,mlu,ipu)

* add npu, mlu to `exclude` field

* empty commit, test=document_fix

* [CodeStyle][E306] remove error code E306 in flake8 config

* empty commit, test=document_fix

* Remove F522,F524,F541 in .flake8 config

* empty commit, test=document_fix

* empty commit, test=document_fix

* Update README.md

* Update README.md

* Update .flake8 config: remove F601 code, text=document_fix

* Update README.md

* Update README.md

* Remove F402 code in config

[CodeStyle][F401] update flake8 F401 config (python_paddle/proto,onnx,optimizer,hapi,autograd,framework,io,cost_model,geometric,vision,static). test=document_fix (#46756)