refactor: move python code generation to runner

[hanxiao]

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[codecov]

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@@           Coverage Diff           @@
##             main     #121   +/-   ##
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  Coverage        ?   63.05%           
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  Files           ?       16           
  Lines           ?     1134           
  Branches        ?        0           
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  Hits            ?      715           
  Misses          ?      419           
  Partials        ?        0           

Flag	Coverage Δ
discoart	63.05% <0.00%> (?)

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