Use cythonize() in pyximport (GH-4339)

Closes https://github.com/cython/cython/issues/2304

1 files changed, 2 insertions, 1 deletions

diff --git a/pyximport/pyximport.py b/pyximport/pyximport.py
index 7ff2ad219..46a5e0c6b 100644
--- a/pyximport/pyximport.py
+++ b/pyximport/pyximport.py
@@ -351,11 +351,12 @@ class PyImporter(PyxImporter):
         self.uncompilable_modules = {}
         self.blocked_modules = ['Cython', 'pyxbuild', 'pyximport.pyxbuild',
                                 'distutils']
+        self.blocked_packages = ['Cython.', 'distutils.']
 
     def find_module(self, fullname, package_path=None):
         if fullname in sys.modules:
             return None
-        if fullname.startswith('Cython.'):
+        if any([fullname.startswith(pkg) for pkg in self.blocked_packages]):
             return None
         if fullname in self.blocked_modules:
             # prevent infinite recursion