Switch to python3

Darwin/lib/python3.4/site-packages/setuptools/extension.py

@@ -0,0 +1,46 @@
+import sys
+import distutils.core
+import distutils.extension
+
+from setuptools.dist import _get_unpatched
+
+_Extension = _get_unpatched(distutils.core.Extension)
+
+def have_pyrex():
+    """
+    Return True if Cython or Pyrex can be imported.
+    """
+    pyrex_impls = 'Cython.Distutils.build_ext', 'Pyrex.Distutils.build_ext'
+    for pyrex_impl in pyrex_impls:
+        try:
+            # from (pyrex_impl) import build_ext
+            __import__(pyrex_impl, fromlist=['build_ext']).build_ext
+            return True
+        except Exception:
+            pass
+    return False
+
+
+class Extension(_Extension):
+    """Extension that uses '.c' files in place of '.pyx' files"""
+
+    def __init__(self, *args, **kw):
+        _Extension.__init__(self, *args, **kw)
+        if not have_pyrex():
+            self._convert_pyx_sources_to_c()
+
+    def _convert_pyx_sources_to_c(self):
+        "convert .pyx extensions to .c"
+        def pyx_to_c(source):
+            if source.endswith('.pyx'):
+                source = source[:-4] + '.c'
+            return source
+        self.sources = list(map(pyx_to_c, self.sources))
+
+class Library(Extension):
+    """Just like a regular Extension, but built as a library instead"""
+
+distutils.core.Extension = Extension
+distutils.extension.Extension = Extension
+if 'distutils.command.build_ext' in sys.modules:
+    sys.modules['distutils.command.build_ext'].Extension = Extension