René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Increase parameter limit for trait beyond 7 argumentsIntoPyNativeFn","articleBody":"## Summary  \n  \nThe current `IntoPyNativeFn` trait implementation has a hard limit of 7 parameters (excluding `\u0026VirtualMachine`), which prevents defining Python methods with more arguments using the `#[pymethod]` attribute.  \n  \n## Problem  \n  \nWhen trying to define a Python method with more than 7 parameters, the compiler fails with:\nerror[E0277]: the trait bound is not satisfiedfn(..., ..., i32, f32, i32, i32, i32, i32, i32, i32, i32, ...) -\u003e ... {...::orb}: IntoPyNativeFn\u003c...\u003e\n\n  \n## Example  \n  \nThis function fails to compile due to having 11 parameters:  \n```rust  \n#[pymethod]  \nfn orb(  \n    query_path: String,  \n    source_path: String,  \n    nfeatures: i32,  \n    scale_factor: f32,  \n    nlevels: i32,  \n    edge_threshold: i32,  \n    first_level: i32,  \n    wta_k: i32,  \n    score_type: i32,  \n    patch_size: i32,  \n    fast_threshold: i32,  \n    vm: \u0026VirtualMachine,  \n) -\u003e PyResult\u003cPyObjectRef\u003e { ... }  \nWhile this function with 7 parameters compiles successfully:\n\n#[pymethod]  \nfn sift(  \n    query_path: String,  \n    source_path: String,  \n    nfeatures: i32,  \n    n_octave_layers: i32,  \n    contrast_threshold: f64,  \n    edge_threshold: f64,  \n    sigma: f64,  \n    vm: \u0026VirtualMachine  \n) -\u003e PyResult\u003cPyObjectRef\u003e { ... }\n\n\n\n\nExtend the macro to support more parameter combinations, perhaps up to 15-20 parameters. \n\n","author":{"url":"https://github.com/topcoco","@type":"Person","name":"topcoco"},"datePublished":"2025-08-16T11:02:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/6098/RustPython/issues/6098"}