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[stdlib] Add `Dict._resize_down` and `_under_load_factor()`

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Hello, this is a PR to solve a problem mentioned by @bethebunny (in #3128) Good little feature to have, it probably should not be a default and be parametrized, because...

[Stdlib] Add `PythonObject.__contains__`

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Simple and small implementation, Improving the `🐍 Python` experience ! Example usage: ```mojo x = PythonObject([1,2,3]) if 1 in x: print("1 in x") ``` That method should be replaced by...

[Stdlib] Speedup `Dict` (reuse removed _DictIndex slots (not entries))

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Hello, `🐍 python` went trough it's adventure of improving its dictionary, there are many Python conference ▶️ videos that talks about that, the speakers explains so well what is a...

### Bug description Hello, after implementing `List.__contains__` for `Scalar[DT]`, tests failed with `DType.bool` ! Minimal repro: ```mojo alias width = simdwidthof[DType.bool]() var x = DTypePointer[DType.bool].alloc(width) alias T = SIMD[DType.bool, width]...

[Stdlib] Add `Dict.__init__` overload with `power_of_two_initial_capacity`

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Hello, here is a new `__init__` that let user specify the initial reservation. Skipping the un-necessary growth phases when the final size is known to be big.   2.2x speedup...

Websocket: first commit

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Hello, here is what we've got so far: - upgrade http request to websocket - send all size - receive all size - works with select for non-blocking *all sizes...

[stdlib] Add examples for `env_get_int` and `sizeof`

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Hello, this commit adds a few examples: - `env_get_int` for parametrizing - `sizeof` for sizes

[BUG] Error on `return` a `SIMD[ , 2]` in `alias`

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### Bug description Hello, it is a bug experienced by @soraros , on the chat: ```mojo fn f() -> SIMD[DType.float32, 2]: return SIMD[DType.float32, 2](0, 1) fn main(): alias v =...

Hello, this commit adds an example for `constrained`. --- Note that `num_physical_cores()` fail on `Ubuntu`: > unable to interpret call to unknown external function (`mojo 2024.10.205 (26f6391e)`) is a new...

### Review Mojo's priorities - [X] I have read the [roadmap and priorities](https://docs.modular.com/mojo/roadmap.html#overall-priorities) and I believe this request falls within the priorities. ### What is your request? It would be...