importing python packages

We are calling python from api proxy. We have referenced python modules under apigee thirdparty folder. But it's still throws below error. Not sure what's wrong.

Sample Script:

import json

print "testing"

Error:

{"fault":{"faultstring":"Evaluation of script testing.py (py) failed with reason: \"AttributeError: 'str' object has no attribute 'format'\"","detail":{"errorcode":"steps.script.ScriptEvaluationFailed"}}}
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