SideEffect support in python SDK?

Workflow side effect is supported in other languages’ SDKs but not python’s. Is it still under development?
Is temporalio.workflow.unsafe.is_replaying meant to be a drop-in replacement for side effect?

You should use local activities in place of side effect, they are mostly the same thing. The absence of side effect is intentional in all newer SDKs (i.e. TypeScript, Python, .NET, and Ruby) because local activities is the suggested approach.

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SideEffect was created before the concept of local activity existed.