python: make the main bindings _magnum, not magnum._magnum.

src/python/magnum/CMakeLists.txt

@@ -40,7 +40,7 @@ target_link_libraries(magnum PRIVATE Magnum::Magnum)
 set_target_properties(magnum PROPERTIES
     FOLDER "python"
     OUTPUT_NAME "_magnum"
-    LIBRARY_OUTPUT_DIRECTORY ${output_dir}/magnum)
+    LIBRARY_OUTPUT_DIRECTORY ${output_dir})
 
 if(Magnum_GL_FOUND)
     set(magnum_gl_SRCS

src/python/magnum/__init__.py

@@ -25,13 +25,13 @@
 
 """Root Magnum module"""
 
-from ._magnum import *
+from _magnum import *
 
 # This feels extremely hackish, but without that it wouldn't be possible to
 # do `import magnum.math`, which is weird (`from magnum import math` works,
 # tho, for whatever reason)
 import sys
-sys.modules['magnum.math'] = _magnum.math
+sys.modules['magnum.math'] = math
 
 __all__ = [
     'Deg', 'Rad',

src/python/setup.py.cmake

@@ -32,7 +32,7 @@ from setuptools.command.build_ext import build_ext
 extension_paths = {
     # Filled in by cmake
     'corrade.containers': '$<TARGET_FILE:corrade_containers>',
-    'magnum._magnum': '$<TARGET_FILE:magnum>',
+    '_magnum': '$<TARGET_FILE:magnum>',
     'magnum.gl': '${magnum_gl_file}',
     'magnum.meshtools': '${magnum_meshtools_file}',
     'magnum.primitives': '${magnum_primitives_file}',