Fix importing of namespace packages. Add in a regtest for the same.

pyximport/pyximport.py

@@ -249,6 +249,10 @@ class PyxImporter(object):
     def find_module(self, fullname, package_path=None):
         if fullname in sys.modules  and  not pyxargs.reload_support:
             return None  # only here when reload()
+
+        # package_path might be a _NamespacePath. Convert that into a list...
+        if package_path is not None and not isinstance(package_path, list):
+            package_path = list(package_path)
         try:
             fp, pathname, (ext,mode,ty) = imp.find_module(fullname,package_path)
             if fp: fp.close()  # Python should offer a Default-Loader to avoid this double find/open!

tests/pyximport/pyximport_namespace.srctree

+
+PYTHON -c "import basic_test; basic_test.test()"
+
+######## basic_test.py ########
+
+import os.path
+import pyximport
+
+pyximport.install(build_dir=os.path.join(os.path.dirname(__file__), "TEST_TMP"))
+
+def test():
+    import nsmod.mymodule
+    assert nsmod.mymodule.test_string == "TEST"
+    assert not nsmod.mymodule.__file__.rstrip('oc').endswith('.py'), nsmod.mymodule.__file__
+
+######## nsmod/mymodule.pyx ########
+
+test_string = "TEST"