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MicroPython, not full CPython. Run executes committed source. Port labels and Python keys are independent. Connected inputs require current upstream results.

Ports and properties
Saved fixtures
Run limits · this session

Defaults: 10 s initialization, 2 s execution, 4 MiB Python GC heap, 16 KiB logs, 256 KiB output. The heap is not a total browser memory limit.


    
  
  
Trust this project’s Python?
Run only code you trust. The official MicroPython build includes host interop; restrictions here are defense in depth, not a security sandbox. Code may be able to reach this local service or other worker capabilities. Cancellation cannot undo external effects.

  
    
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Definitions contain overlays and products. Bindings map target JSON Pointers to overlay value sources. Closing retains drafts; Save, navigation and Run commit them.

    

    
    
  
  
  
    
Types

    
Define reusable types for ports and literals.

    
    
Record types

    
String types

    
Patterns match the entire value. Length bounds count UTF-8 bytes. Applying a change validates existing literals.

    

    

      
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