need to import os

cms/envs/dev.py

@@ -172,6 +172,7 @@ MITX_FEATURES['ENABLE_SERVICE_STATUS'] = True
 
 # If there's an environment variable set, grab it and turn on Segment.io
 # Note that this is the Studio key. There is a separate key for the LMS.
+import os
 SEGMENT_IO_KEY = os.environ.get('SEGMENT_IO_KEY')
 if SEGMENT_IO_KEY:
     MITX_FEATURES['SEGMENT_IO'] = True