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Modify an existing Code node

"Something's in the field" isn't the same as a real value — a friendly "N/A" can sail through as non-empty and quietly wreck averages downstream.

Tighten the Python Code node so humidity must be numeric, re-run the flow, and let Is Valid? show who gets kicked to the stricter branch.

This exercise is part of the course

Intermediate Workflow Automation with n8n

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