Check a system enviornment variable before trying to compile extensions, skip if it is set.

setup.py

@@ -1,79 +1,17 @@
-from setuptools import Extension, setup
+import os
+from setuptools import setup
+
+
+def extensions():
+    if 'PURE_PYTHON' in os.environ:
+        # We've been asked not to compile extensions.
+        return []
+
+    from setuptools import Extension
     from Cython.Build import cythonize
 
-setup(
+    return [
-    name='bemani',
+        *cythonize(
-    version='1.0',
-    description='Code and utilities for talking to BEMANI games',
-    author='DragonMinded',
-    license='Public Domain',
-    packages=[
-        # Core packages
-        'bemani',
-        'bemani.common',
-        'bemani.data',
-        'bemani.data.api',
-        'bemani.data.mysql',
-        'bemani.protocol',
-
-        # Wrapper scripts and WSGI imports
-        'bemani.utils',
-
-        # Frontend packages
-        'bemani.frontend',
-        'bemani.frontend.account',
-        'bemani.frontend.admin',
-        'bemani.frontend.arcade',
-        'bemani.frontend.home',
-        'bemani.frontend.static',
-        'bemani.frontend.templates',
-
-        # Game frontends
-        'bemani.frontend.iidx',
-        'bemani.frontend.popn',
-        'bemani.frontend.jubeat',
-        'bemani.frontend.bishi',
-        'bemani.frontend.ddr',
-        'bemani.frontend.sdvx',
-        'bemani.frontend.reflec',
-        'bemani.frontend.museca',
-
-        # Backend packages
-        'bemani.backend',
-        'bemani.backend.core',
-        'bemani.backend.ess',
-        'bemani.backend.iidx',
-        'bemani.backend.jubeat',
-        'bemani.backend.popn',
-        'bemani.backend.bishi',
-        'bemani.backend.ddr',
-        'bemani.backend.sdvx',
-        'bemani.backend.reflec',
-        'bemani.backend.museca',
-
-        # API packages
-        'bemani.api',
-        'bemani.api.objects',
-
-        # Testing game client packages
-        'bemani.client',
-        'bemani.client.iidx',
-        'bemani.client.jubeat',
-        'bemani.client.popn',
-        'bemani.client.bishi',
-        'bemani.client.ddr',
-        'bemani.client.sdvx',
-        'bemani.client.reflec',
-        'bemani.client.museca',
-    ],
-    install_requires=[
-        req for req in open('requirements.txt').read().split('\n') if len(req) > 0
-    ],
-    # None of these are required for operating any of the utilities found in this repo.
-    # They are all present for speed. If you cannot compile arbitrary code or cython,
-    # remove the ext_modules line and run setuptools again. Everything should work, but
-    # it will run slower.
-    ext_modules=cythonize(
             [
                 Extension(
                     "bemani.protocol.binary",
@@ -151,6 +89,82 @@ setup(
             ],
             language_level=3,
         ),
+    ]
+
+
+setup(
+    name='bemani',
+    version='1.0',
+    description='Code and utilities for talking to BEMANI games',
+    author='DragonMinded',
+    license='Public Domain',
+    packages=[
+        # Core packages
+        'bemani',
+        'bemani.common',
+        'bemani.data',
+        'bemani.data.api',
+        'bemani.data.mysql',
+        'bemani.protocol',
+
+        # Wrapper scripts and WSGI imports
+        'bemani.utils',
+
+        # Frontend packages
+        'bemani.frontend',
+        'bemani.frontend.account',
+        'bemani.frontend.admin',
+        'bemani.frontend.arcade',
+        'bemani.frontend.home',
+        'bemani.frontend.static',
+        'bemani.frontend.templates',
+
+        # Game frontends
+        'bemani.frontend.iidx',
+        'bemani.frontend.popn',
+        'bemani.frontend.jubeat',
+        'bemani.frontend.bishi',
+        'bemani.frontend.ddr',
+        'bemani.frontend.sdvx',
+        'bemani.frontend.reflec',
+        'bemani.frontend.museca',
+
+        # Backend packages
+        'bemani.backend',
+        'bemani.backend.core',
+        'bemani.backend.ess',
+        'bemani.backend.iidx',
+        'bemani.backend.jubeat',
+        'bemani.backend.popn',
+        'bemani.backend.bishi',
+        'bemani.backend.ddr',
+        'bemani.backend.sdvx',
+        'bemani.backend.reflec',
+        'bemani.backend.museca',
+
+        # API packages
+        'bemani.api',
+        'bemani.api.objects',
+
+        # Testing game client packages
+        'bemani.client',
+        'bemani.client.iidx',
+        'bemani.client.jubeat',
+        'bemani.client.popn',
+        'bemani.client.bishi',
+        'bemani.client.ddr',
+        'bemani.client.sdvx',
+        'bemani.client.reflec',
+        'bemani.client.museca',
+    ],
+    install_requires=[
+        req for req in open('requirements.txt').read().split('\n') if len(req) > 0
+    ],
+    # None of these are required for operating any of the utilities found in this repo.
+    # They are all present for speed. If you cannot compile arbitrary code or cython,
+    # remove the ext_modules line and run setuptools again. Everything should work, but
+    # it will run slower.
+    ext_modules=extensions(),
     include_package_data=True,
     zip_safe=False,
 )