python wrapper

python/quantalib/_loader.py

@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+import ctypes
+import platform
+from pathlib import Path
+
+
+_PLATFORM_MAP: dict[tuple[str, str], str] = {
+    ("Windows", "AMD64"): "win_amd64/quantalib_native.dll",
+    ("Linux", "x86_64"): "linux_x86_64/quantalib_native.so",
+    ("Darwin", "arm64"): "macosx_arm64/quantalib_native.dylib",
+    ("Darwin", "x86_64"): "macosx_x86_64/quantalib_native.dylib",
+}
+
+
+def _native_root() -> Path:
+    return Path(__file__).resolve().parent / "native"
+
+
+def _native_relative_path() -> str:
+    key = (platform.system(), platform.machine())
+    if key not in _PLATFORM_MAP:
+        raise OSError(
+            f"Unsupported platform/architecture: system={key[0]!r}, arch={key[1]!r}"
+        )
+    return _PLATFORM_MAP[key]
+
+
+def native_library_path() -> Path:
+    return _native_root() / _native_relative_path()
+
+
+def load_native_library() -> ctypes.CDLL:
+    path = native_library_path()
+    if not path.exists():
+        raise OSError(
+            "quantalib native library not found. "
+            f"Expected: {path} "
+            f"(system={platform.system()}, arch={platform.machine()})"
+        )
+    return ctypes.CDLL(str(path))