py37-freeze will be tackled in https://github.com/pytest-dev/pytest/issues/4807
W191 indentation contains tabs W292 no newline at end of file W293 blank line contains whitespace W391 blank line at end of file
cx_freeze doesn't seem to be very well supported in Python 3.5. Using pyinstaller instead and rename environment to "freeze" which is a more generic term for freezing python code into standalone executables. Fix #1769