Correct filenames according to the OS.

Author: PMeira

dss_python_backend/__init__.py

@@ -6,19 +6,31 @@
 For better maintenance and evolution of the Python-only code, the module was split in two. 
 '''
 
-import os
+import os, sys
 from . import _altdss_capi_loader
 from ._altdss_capi_loader import ffi, lib as loader_lib
 from pathlib import Path
 
 altdss_lib_parent_path = Path(_altdss_capi_loader.__file__).absolute().parent
 
+if sys.platform == 'win32':
+    DLL_SUFFIX = '.dll'
+    DLL_PREFIX = ''
+elif sys.platform in ('linux', 'linux2'):
+    DLL_SUFFIX = '.so'
+    DLL_PREFIX = 'lib'
+elif sys.platform == 'darwin':
+    DLL_SUFFIX = '.dylib'
+    DLL_PREFIX = 'lib'
+else:
+    raise RuntimeError("Unsupported platform!")
+
 if os.environ.get('DSS_EXTENSIONS_DEBUG', '') != '1':
-    altdss_lib_path = altdss_lib_parent_path.joinpath('libaltdss_capi.so')
+    altdss_lib_path = altdss_lib_parent_path.joinpath(f'{DLL_PREFIX}altdss_capi{DLL_SUFFIX}')
 else:
     import warnings
     warnings.warn('Environment variable DSS_EXTENSIONS_DEBUG=1 is set: loading the debug version of the DSS C-API library')
-    altdss_lib_path = altdss_lib_parent_path.joinpath('libaltdss_capid.so')
+    altdss_lib_path = altdss_lib_parent_path.joinpath(f'{DLL_PREFIX}altdss_capid{DLL_SUFFIX}')
 
 if not altdss_lib_path.exists():
     raise RuntimeError('AltDSS library not found!')