backend

backend

What "run the captured block" means.

A Tracer captures a with block but does not decide where it runs — it hands the block to a backend. Swapping the backend is how the same trace becomes a local run, a remote job, or a simulation without the tracer knowing the difference. The base backend runs the block in place; higher layers subclass it to send the block elsewhere.

Backend

Run a tracer's captured block; the base default runs it in place.

Subclasses override __call__ to run the block somewhere else (a remote worker, a simulation), reading the compiled code and captured frame from info.

__call__

__call__(tracer: Tracer) -> None

Execute tracer's captured block in the caller's process.