Python 3.8 will probably [raise SyntaxWarnings](https://docs.python.org/3/whatsnew/3.8.html#changes-in-python-behavior) on the flake8 F632 issue raised below.
[flake8](http://flake8.pycqa.org) testing of https://github.com/spulec/moto on Python 3.7.1
$ __flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics__
```
./tests/test_awslambda/test_lambda.py:1137:24: F632 use ==/!= to compare str, bytes, and int literals
assert len(messages) is 3
^
1 F632 use ==/!= to compare str, bytes, and int literals
1
```
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