Support standalone in python_linter

package.json

@@ -91,7 +91,7 @@
         "c9.ide.imgeditor": "#612e75ef4f",
         "c9.ide.immediate": "#a962119bec",
         "c9.ide.installer": "#0fde9f0067",
-        "c9.ide.language.python": "#b564a19d7e",
+        "c9.ide.language.python": "#ee7b02ba3a",
         "c9.ide.language.go": "#8f6d0beae7",
         "c9.ide.mount": "#86c8985f34",
         "c9.ide.navigate": "#1fbb7cd53b",