[Lang] Fix pylint rule C0200

[kemingy]

Related issue = #3151

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[kemingy]

Can anyone approve the CI workflow? 😄 Otherwise I have to merge master again and again to update the CI pylint check settings.

[k-ye]

Can anyone approve the CI workflow? smile Otherwise I have to merge master again and again to update the CI pylint check settings.

Sure, repushed & retriggered :-)

[yihong0618]

LGTM

[lucywsq]

Hi, @kemingy We are so appreciative of your contribution to fixing pylint rules through the “Let’s become Taichi contributors within 10 minutes” program. Please send an email to siqiwu@taichi.graphics with your offline address. We would deliver a hoodie to you. : ) Looking forward to hearing from you.