Fix Python 3 issues.

Cython/Build/Dependencies.py

@@ -1157,9 +1157,9 @@ def cythonize_one(pyx_file, c_file, fingerprint, quiet, options=None,
         elif os.path.exists(c_file):
             os.remove(c_file)
     elif fingerprint:
-        artifacts = filter(None, [
+        artifacts = list(filter(None, [
             getattr(result, attr, None)
-            for attr in ('c_file', 'h_file', 'api_file', 'i_file')])
+            for attr in ('c_file', 'h_file', 'api_file', 'i_file')]))
         if len(artifacts) == 1:
             fingerprint_file = gz_fingerprint_file
             with open(c_file, 'rb') as f:

Cython/Build/Tests/TestCyCache.py

@@ -58,7 +58,7 @@ class TestInline(CythonTest):
         open(a_pyx, 'w').write('pass')
         self.fresh_cythonize(a_pyx, cache=self.cache_dir)
         a_cache = os.path.join(self.cache_dir, os.listdir(self.cache_dir)[0])
-        gzip.GzipFile(a_cache, 'wb').write('fake stuff')
+        gzip.GzipFile(a_cache, 'wb').write('fake stuff'.encode('ascii'))
         os.unlink(a_c)
         self.fresh_cythonize(a_pyx, cache=self.cache_dir)
         a_contents = open(a_c).read()