PyRust Engine

Make your Python code faster by adding one line.

Put @optimize above a function. PyRust turns it into Rust, compiles it and runs it as native machine code. You keep writing normal Python, and your answers never change: anything PyRust can't run safely runs as normal Python instead.

import math
from pyrust_engine import optimize

def distance(x: float, y: float) -> float:
    return math.sqrt(x * x + y * y)      # helpers are compiled together with their caller

@optimize
def total_distance(n: int) -> float:
    total = 0.0
    for i in range(n):
        total += distance(float(i), float(n - i))
    return total

total_distance(300_000)                  # about 65-110x faster than plain Python in our benchmarks
print(total_distance.explain())          # compiles? if not, which line, why, and how to fix it

What you get
⚡ Speed	7x to 120x on calculation-heavy code: loops, math, bit operations, helper functions, recursion, NumPy arrays
🛟 Exact results	big integers, math errors and unsupported code replay in Python with the same result or exception
🧵 Parallel loops	prange() uses every CPU core for independent iterations
🧰 Everyday values	lists, strings, dicts, sets, float32 embeddings, pandas and polars columns and random, with Python's exact results
🧱 Classes	methods that read and update self.x (dataclasses, __slots__, plain classes); state is written back after the call
🚀 Cheap calls	CPython calls compiled functions directly: about 0.2 µs per call with numbers, arrays or strings
🤖 AI and agents	ready-made pyrust_engine.ai (BM25 and a drop-in BM25Okapi, cosine, binary and int8 top-k with filters, chunking, metrics, batches), suggest/apply, an MCP server
🐼 Whole columns	@vectorize runs a one-value function over arrays, pandas or polars columns (numbers, bools, text) in one native loop
🧶 Free-threaded Python	tested on 3.14t and 3.15t; PyRust never turns the GIL back on
🔍 Clear diagnostics	explain(), one-time warnings with line numbers and hints, python -m pyrust_engine doctor
📦 Easy deployment	pip install pyrust-engine; prebuild libraries so servers don't need Rust

Start with Getting started, see what compiles in the Guide, or browse the Examples.