Fields define the interface of a module, that means they are also the basis of the connector types given above.
They come in two types:
In/out fields — connected by data connections
Parameter fields — connected by parameter connections
Numbers, Strings, Booleans
Field changes trigger events handled by field listeners. Field connections are a special forms of field listeners.
Read Section 2.9, “FieldListener” for information about the use of explicit field listeners for Python scripting.
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