python-lenses

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Compose producing unexpected values

1

The following two snippets produce different results: The following appears to me to be correct: ```py lens.Each().Parts().F(sum).get()([1,2,3]) # returns 6 ``` Whereas I think this is a bug: ```py (lens.Each()...

christopherjmblack

[doc] compare with glom

2

compare with [glom](https://glom.readthedocs.io/)

majidaldo

lens.Tuple but for Getters

2

Hey, it would be useful to have a version of lens.Tuple that accepts two getters. (Implementation in pseudo-code:) Could make a class `GetterTuple(getters)` which has type `Getter` and whose getter...

moteutsch

Setter -> Traversal

3

Python's nonlocal state side effects give every setter traversal powers. You should unify them or have a utility to convert them. I say this because using `re.sub` (which allows a...

Gurkenglas

https://python-lenses.readthedocs.io/en/latest/tutorial/optics.html#setters > This method allows you to create a setter that can set at two different places at once.This method allows you to create a setter that can set at...

yellowbean

Debugging code involving lenses is hard

10

The call stacks end up super deep and the order of operations strange. Have you considered a refactor where `lens.....get()` is compiled into a function block where `.F(getter)` corresponds to...

Gurkenglas