ansible/tower-cli — pull request #10 by tee-jay (2014-08-12 21:51:25+00:00)
Title: Added .read() to extra_vars parameter as it is a File.

extra_vars in job.launch must be read before it's added to the data dictionary. Otherwise, an "is not JSON serializable" exception will result as the requests http lib will attempt to serialize the open file object.