PEP8 imports (https://www.python.org/dev/peps/pep-0008/#imports). Remove unused import statements.

setup.py

@@ -1,10 +1,11 @@
 from __future__ import division, print_function
 
-from setuptools import setup
 import io
 import os
 import re
 
+from setuptools import setup
+
 
 # Example code to pull version from esptool.py with regex, taken from
 # http://python-packaging-user-guide.readthedocs.org/en/latest/single_source_version/