It is not essential but it is safer if the code is changed in the future...
[flake8](http://flake8.pycqa.org) testing of https://github.com/Aidaho12/haproxy-wi on Python 3.7.0
$ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__
```
/home/travis/virtualenv/python3.7.0/lib/python3.7/site-packages/pycodestyle.py:113: FutureWarning: Possible nested set at position 1
EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')
./app/tools/checker_worker.py:70:27: F821 undefined name 'oldstat'
if (currentstat[i] != oldstat[i] and currentstat[i]!="none") and ("FRONTEND" not in str(vips[i]) and "BACKEND" not in str(vips[i])):
^
1 F821 undefined name 'oldstat'
1
```