alt Hacker NewsI can see the first one making sense, but why would you need a representation of equality other than "yes, these are equal" and "no, these are not equal"?
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datsci_est_2015 • today at 2:37 PM
Well personally I’m not a fan of turning everything into an object, but if you have properties or methods that exist upon the concept of Equality you might want to encode directly onto a class. Maybe in a domain where “Equality” is an important concept, like mathematics or even something like accounting.
Could enable a different interface into approximate equality for floating point numbers: Equality.approximate(iota: float) -> bool
The first use case that comes to mind is if you want a DSL to build expressions that are evaluated later in some different context e.g. when using `polars`:
```python df.filter( pl.col("foo") == pl.col("bar"), ) ```
Sqlalchemy does something equivalent too, and I'm sure there are many others.