Python Libraries

Wyn can compile your code into shared libraries that Python can call directly.

Quick Start

Write a Wyn library:

// mathlib.wyn
fn add(a: int, b: int) -> int {
    return a + b
}

fn factorial(n: int) -> int {
    if n <= 1 { return 1 }
    return n * factorial(n - 1)
}

Build with --python:

wyn build mathlib.wyn --python

This produces:

• libmathlib.dylib (or .so on Linux, .dll on Windows)
• mathlib.py — auto-generated Python wrapper

Use from Python:

from mathlib import add, factorial

print(add(2, 3))           # 5
print(factorial(20))        # 2432902008176640000

Type Mapping

Wyn Type	Python Type	Notes
int	int	64-bit integer
float	float	64-bit double
string	str	Auto encode/decode UTF-8
bool	bool	True/False

Flags

Flag	Output
--shared	Shared library only
--python	Shared library + Python wrapper

Notes

• Functions named main are excluded from the wrapper
• Struct methods (with self) are excluded
• String arguments are automatically encoded/decoded