Describe the bug
A clear and concise description of what the bug is.
Clearly mention the code-generators that are affected by this issue.
While trying to clone this repo and run the tester to see that all tests run successfully, me and my teammate (@dasyad00) saw how the crashed, because of a JSON error. I have traced it down to the fact that python binary strings have a b at the start when printed out.

To Reproduce
Steps to reproduce the behavior:

1. Create fresh clone of repo
2. run npm install in terminal and npm run deepinstall dev;
3. run npm test python-requests
4. see where tests fail (JSON parse error)
   Expected code snippet and corresponding request
   If you have a working code snippet that you think solves your problem, please add it here:
   Also, add the request.json for which this code snippet was generated.

Screenshots
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For example you could add the screenshot of the snippet/request builder from Postman app.

Additional context
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Version of postman-code-generators/Postman app:
Latest version of master branch in github.
The error resides in the newmanTestUtil.js line 87