The next line refers to __e__ twice but it is never defined.
flake8 testing of https://github.com/Aidaho12/haproxy-wi on Python 3.6.3
$ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__
```
./app/delver.py:58:36: F821 undefined name 'e'
stderr = "Error: %s - %s." % (e.filename,e.strerror)
^
./app/delver.py:58:47: F821 undefined name 'e'
stderr = "Error: %s - %s." % (e.filename,e.strerror)
^
2 F821 undefined name 'e'
2
```