fix: Resolve alt.binding signature/docstring issues
#3671
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- `Binding` is not generic, it is a union of all bindings - It has no doc or parameters - `binding()` currently forces this function to be `BindInput` as `input` is a required argument
- Discovered the backwards incompatibility during testing - Manually spelling out the signature & copying the docs; was the only reliable method I found
- Ensures new signature is fully backwards compatible - Demonstrates (previously) inconsistent typing behavior that is now resolved
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I noticed a few problems with
alt.bindingduring #3544.Bug
We have one example (scatter_point_paths_hover) that uses the function.
Code reference
altair/tests/examples_arguments_syntax/scatter_point_paths_hover.py
Line 33 in 88c76e3
altair/tests/examples_methods_syntax/scatter_point_paths_hover.py
Line 33 in 88c76e3
pyright- but notmypy- thinks there is an issue here and displays this warning:Since the warning is being emitted - despite the example working as intended - I'd consider this a false-negative.
Besides the warning, you can see that:
This is not purely an issue with
pyright, but can be seen in the API Reference.Fix
The tests added in (0266b8d) demonstrate most of what is fixed.
However, a much bigger improvement can be seen in the now-meaningful signature and docstring for
alt.binding:These benefits will also be present in the
5.5.0API Reference