diff --git a/.gitignore b/.gitignore
index 7c0a9172..b180e87e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,4 +14,6 @@ env/
 .project
 .pydevproject
 tests/test_bugfix.py
-htmlcov/
\ No newline at end of file
+htmlcov/
+venv
+venv3
diff --git a/mongoengine/python_support.py b/mongoengine/python_support.py
index e51e1bc9..4c79a259 100644
--- a/mongoengine/python_support.py
+++ b/mongoengine/python_support.py
@@ -2,6 +2,10 @@
 Helper functions, constants, and types to aid with Python v2.7 - v3.x and
 PyMongo v2.7 - v3.x support.
 """
+
+import sys
+import warnings
+
 import pymongo
 import six