fix microsoft#294

DonJayamanne · DonJayamanne · commit faec5145f751 · 2016-09-09T11:47:11.000+10:00
diff --git a/snippets/python.json b/snippets/python.json
@@ -190,6 +190,7 @@
             "\t${pass}",
             "",
             "if __name__ == '__main__':",
+            "\timport sys",
             "\tsys.exit(int(main() or 0))"
         ],
         "description": "Code snippet for a main function"
