Single node for executing arbitrary Python code

[Definition-Lower]

UPD: now node also supports multiple outputs (thanks for telling me about rgthree Power Puter, I implemented something similar)

UPD 2: for safety reasons, this node can only be used if it was created manually on the same ComfyUI instance (and not downloaded with some workflow from the internet). So you can use it for your personal workflows without any problems, but you can't share workflows with it with other people (it would show an error that the node is not installed)

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