diff --git a/.travis.yml b/.travis.yml
index 6b6f935..98f4853 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -96,6 +96,8 @@ install:
   - easy_install --version
   - pip --version
   - tox --version
+  - sudo apt-get install graphviz
+  - sudo apt-get install plantuml
 
 script:
   - tox -v
diff --git a/docs/conf.py b/docs/conf.py
index 9b44879..256847d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,7 +1,10 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-import sys, os, subprocess
+import errno
+import os
+import subprocess
+import sys
 
 # Append src directory to path so that autodoc can find the python module
 sys.path.append("src")
@@ -20,14 +23,14 @@ extensions = [
     'sphinxcontrib.plantuml',
 ]
 if os.getenv('SPELLCHECK'):
-    extensions += 'sphinxcontrib.spelling',
+    extensions.append('sphinxcontrib.spelling')
     spelling_show_suggestions = True
     spelling_lang = 'en_US'
 
 source_suffix = '.rst'
 master_doc = 'index'
 project = 'warning-plugin'
-year = '2017-2018'
+year = '2017-2019'
 author = 'Bavo Van Achte'
 copyright = '{0}, {1}'.format(year, author)
 
@@ -54,7 +57,7 @@ html_use_smartypants = True
 html_last_updated_fmt = '%b %d, %Y'
 html_split_index = False
 html_sidebars = {
-   '**': ['searchbox.html', 'globaltoc.html', 'sourcelink.html'],
+    '**': ['searchbox.html', 'globaltoc.html', 'sourcelink.html'],
 }
 html_short_title = '%s-%s' % (project, version)
 
@@ -66,7 +69,7 @@ napoleon_use_param = False
 # confirm we have plantuml in the path
 if 'nt' in os.name:
     plantuml_path = subprocess.check_output(["where", "/F", "plantuml.jar"])
-    if not plantuml_path :
+    if not plantuml_path:
         print("Can't find 'plantuml.jar' file.")
         print("You need to add path to 'plantuml.jar' file to your PATH variable.")
         sys.exit(os.strerror(errno.EPERM))
@@ -77,9 +80,7 @@ if 'nt' in os.name:
     plantuml = 'java -jar' + ' ' + plantuml
 else:
     plantuml_path = subprocess.check_output(["whereis", "-u", "plantuml"])
-    if not plantuml_path :
+    if not plantuml_path:
         print("Can't find 'plantuml.jar' file.")
         print("You need to add path to 'plantuml.jar' file to your PATH variable.")
         sys.exit(os.strerror(errno.EPERM))
-
-
diff --git a/src/mlx/warnings.py b/src/mlx/warnings.py
index 0455636..7cf710a 100644
--- a/src/mlx/warnings.py
+++ b/src/mlx/warnings.py
@@ -4,12 +4,14 @@
 from __future__ import print_function
 
 import argparse
+import errno
+import glob
 import json
-import os
 import subprocess
 import sys
-import glob
-from mlx.warnings_checker import SphinxChecker, DoxyChecker, JUnitChecker, XMLRunnerChecker, CoverityChecker
+
+from mlx.warnings_checker import CoverityChecker, DoxyChecker, JUnitChecker, SphinxChecker, XMLRunnerChecker
+
 from .__warnings_version__ import version as warnings_version
 
 __version__ = warnings_version
@@ -17,22 +19,22 @@ __version__ = warnings_version
 
 class WarningsPlugin:
 
-    def __init__(self, verbose = False, configfile= None):
+    def __init__(self, verbose=False, config_file=None):
         '''
         Function for initializing the parsers
 
         Args:
-            verbose (bool, optional):           enable verbose logging
-            configfile (filename, optional):    configuration file with setup
+            verbose (bool): optional - enable verbose logging
+            config_file (str): optional - configuration file with setup
         '''
-        self.checkerList = {}
+        self.checker_list = {}
         self.verbose = verbose
-        self.publicCheckers = [SphinxChecker(self.verbose), DoxyChecker(self.verbose), JUnitChecker(self.verbose),
-                               XMLRunnerChecker(self.verbose), CoverityChecker(self.verbose)]
+        self.public_checkers = [SphinxChecker(self.verbose), DoxyChecker(self.verbose), JUnitChecker(self.verbose),
+                                XMLRunnerChecker(self.verbose), CoverityChecker(self.verbose)]
 
-        if configfile is not None:
-            with open(configfile, 'r') as f:
-                config = json.load(f)
+        if config_file:
+            with open(config_file, 'r') as open_file:
+                config = json.load(open_file)
             self.config_parser_json(config)
 
         self.warn_min = 0
@@ -45,10 +47,10 @@ class WarningsPlugin:
         Activate additional checkers after initialization
 
         Args:
-            checker (WarningsChecker):         checker object
+            checker (WarningsChecker): checker object
         '''
         checker.reset()
-        self.checkerList[checker.name] = checker
+        self.checker_list[checker.name] = checker
 
     def activate_checker_name(self, name):
         '''
@@ -57,7 +59,7 @@ class WarningsPlugin:
         Args:
             name (str): checker name
         '''
-        for checker in self.publicCheckers:
+        for checker in self.public_checkers:
             if checker.name == name:
                 self.activate_checker(checker)
                 break
@@ -72,7 +74,7 @@ class WarningsPlugin:
         Return:
             checker object (WarningsChecker)
         '''
-        return self.checkerList[name]
+        return self.checker_list[name]
 
     def check(self, content):
         '''
@@ -84,10 +86,10 @@ class WarningsPlugin:
         if self.printout:
             print(content)
 
-        if len(self.checkerList) == 0:
+        if not self.checker_list:
             print("No checkers activated. Please use activate_checker function")
         else:
-            for name, checker in self.checkerList.items():
+            for checker in self.checker_list.values():
                 checker.check(content)
 
     def set_maximum(self, maximum):
@@ -96,7 +98,7 @@ class WarningsPlugin:
         Args:
             maximum (int): maximum amount of warnings allowed
         '''
-        for name, checker in self.checkerList.items():
+        for checker in self.checker_list.values():
             checker.set_maximum(maximum)
 
     def set_minimum(self, minimum):
@@ -105,10 +107,10 @@ class WarningsPlugin:
         Args:
             minimum (int): minimum amount of warnings allowed
         '''
-        for name, checker in self.checkerList.items():
+        for checker in self.checker_list.values():
             checker.set_minimum(minimum)
 
-    def return_count(self, name = None):
+    def return_count(self, name=None):
         ''' Getter function for the amount of found warnings
 
         If the name parameter is set, this function will return the amount of
@@ -123,32 +125,32 @@ class WarningsPlugin:
         '''
         self.count = 0
         if name is None:
-            for name, checker in self.checkerList.items():
+            for checker in self.checker_list.values():
                 self.count += checker.return_count()
         else:
-            self.count = self.checkerList[name].return_count()
+            self.count = self.checker_list[name].return_count()
         return self.count
 
-    def return_check_limits(self, name = None):
+    def return_check_limits(self, name=None):
         ''' Function for determining the return value of the script
 
         If the name parameter is set, this function will check (and return) the
         return value of that checker. If not, this function checks whether the
-        warnings for each registred checker are within the configured limits.
+        warnings for each registered checker are within the configured limits.
 
         Args:
             name (WarningsChecker): The checker for which to check the return value
 
         Return:
-            int: 0 if the amount warnings are within limits otherwise 1
+            int: 0 if the amount of warnings is within limits, 1 otherwise
         '''
         if name is None:
-            for name, checker in self.checkerList.items():
+            for checker in self.checker_list.values():
                 retval = checker.return_check_limits()
-                if retval != 0:
+                if retval:
                     return retval
         else:
-            return self.checkerList[name].return_check_limits()
+            return self.checker_list[name].return_check_limits()
 
         return 0
 
@@ -158,26 +160,26 @@ class WarningsPlugin:
         Useful for command input where we want to print content as well
 
         Args:
-            printout: True enables the printout, False provides more silent mode
+            printout (bool): True enables the printout, False provides more silent mode
         '''
         self.printout = printout
 
     def config_parser_json(self, config):
-        ''' Parsing configuration dict extracted by previously opened json file
+        ''' Parsing configuration dict extracted by previously opened JSON file
 
         Args:
-            config (dict): json dump of the configuration
+            config (dict): JSON dump of the configuration
         '''
         # activate checker
-        for checker in self.publicCheckers:
+        for checker in self.public_checkers:
             try:
                 if bool(config[checker.name]['enabled']):
                     self.activate_checker(checker)
                     self.get_checker(checker.name).set_maximum(int(config[checker.name]['max']))
                     self.get_checker(checker.name).set_minimum(int(config[checker.name]['min']))
                     print("Config parsing for {name} completed".format(name=checker.name))
-            except KeyError as e:
-                print("Incomplete config. Missing: {key}".format(key=e))
+            except KeyError as err:
+                print("Incomplete config. Missing: {key}".format(key=err))
 
 
 def warnings_wrapper(args):
@@ -193,7 +195,8 @@ def warnings_wrapper(args):
     group1.add_argument('--minwarnings', type=int, required=False, default=0,
                         help='Minimum amount of warnings accepted')
     group2 = parser.add_argument_group('Configuration file with options')
-    group2.add_argument('--config', dest='configfile', action='store', required=False, help='Config file in JSON format provides toggle of checkers and their limits')
+    group2.add_argument('--config', dest='configfile', action='store', required=False,
+                        help='Config file in JSON format provides toggle of checkers and their limits')
     parser.add_argument('-v', '--verbose', dest='verbose', action='store_true')
     parser.add_argument('--command', dest='command', action='store_true',
                         help='Treat program arguments as command to execute to obtain data')
@@ -201,7 +204,8 @@ def warnings_wrapper(args):
                         help='Ignore return value of the executed command')
     parser.add_argument('--version', action='version', version='%(prog)s {version}'.format(version=__version__))
     parser.add_argument('logfile', nargs='+', help='Logfile (or command) that might contain warnings')
-    parser.add_argument('flags', nargs=argparse.REMAINDER, help='Possible not-used flags from above are considered as command flags')
+    parser.add_argument('flags', nargs=argparse.REMAINDER,
+                        help='Possible not-used flags from above are considered as command flags')
 
     args = parser.parse_args(args)
 
@@ -211,7 +215,7 @@ def warnings_wrapper(args):
         if checkersflag or (args.maxwarnings != 0) or (args.minwarnings != 0):
             print("Configfile cannot be provided with other arguments")
             sys.exit(2)
-        warnings = WarningsPlugin(verbose=args.verbose, configfile=args.configfile)
+        warnings = WarningsPlugin(verbose=args.verbose, config_file=args.configfile)
     else:
         warnings = WarningsPlugin(verbose=args.verbose)
         if args.sphinx:
@@ -254,11 +258,10 @@ def warnings_command(warnings, cmd):
 
     Args:
         warnings (WarningsPlugin): Object for warnings where errors should be logged
-        cmd: Command list, which should be executed to obtain input for parsing
-        ignore: Flag to ignore return value of the command
+        cmd (list): List of commands (str), which should be executed to obtain input for parsing
 
     Return:
-        retval: Return value of executed command
+        int: Return value of executed command(s)
 
     Raises:
         OSError: When program is not installed.
@@ -282,8 +285,8 @@ def warnings_command(warnings, cmd):
             except AttributeError:
                 warnings.check(err)
         return proc.returncode
-    except OSError as e:
-        if e.errno == os.errno.ENOENT:
+    except OSError as err:
+        if err.errno == errno.ENOENT:
             print("It seems like program " + str(cmd) + " is not installed.")
         raise
 
@@ -323,4 +326,3 @@ def main():
 
 if __name__ == '__main__':
     main()
-
diff --git a/src/mlx/warnings_checker.py b/src/mlx/warnings_checker.py
index 2728533..e7af4ab 100644
--- a/src/mlx/warnings_checker.py
+++ b/src/mlx/warnings_checker.py
@@ -3,9 +3,9 @@
 
 import abc
 import re
-from junitparser import JUnitXml, Failure, Error
 from xml.etree.ElementTree import ParseError
 
+from junitparser import Error, Failure, JUnitXml
 
 DOXYGEN_WARNING_REGEX = r"(?:((?:[/.]|[A-Za-z]).+?):(-?\d+):\s*([Ww]arning|[Ee]rror)|<.+>:-?\d+(?::\s*([Ww]arning|[Ee]rror))?): (.+(?:(?!\s*(?:[Nn]otice|[Ww]arning|[Ee]rror): )[^/<\n][^:\n][^/\n].+)*)|\s*([Nn]otice|[Ww]arning|[Ee]rror): (.+)\n?"
 doxy_pattern = re.compile(DOXYGEN_WARNING_REGEX)
@@ -59,7 +59,8 @@ class WarningsChecker(object):
             ValueError: Invalid argument (min limit higher than max limit)
         '''
         if self.warn_min > maximum:
-            raise ValueError("Invalid argument: mininum limit ({min}) is higher than maximum limit ({max}). Cannot enter {value}". format(min=self.warn_min, max=self.warn_max, value=maximum))
+            raise ValueError("Invalid argument: mininum limit ({0.warn_min}) is higher than maximum limit "
+                             "({0.warn_max}). Cannot enter {value}". format(self, value=maximum))
         else:
             self.warn_max = maximum
 
@@ -81,7 +82,8 @@ class WarningsChecker(object):
             ValueError: Invalid argument (min limit higher than max limit)
         '''
         if minimum > self.warn_max:
-            raise ValueError("Invalid argument: mininum limit ({min}) is higher than maximum limit ({max}). Cannot enter {value}". format(min=self.warn_min, max=self.warn_max, value=minimum))
+            raise ValueError("Invalid argument: mininum limit ({0.warn_min}) is higher than maximum limit "
+                             "({0.warn_max}). Cannot enter {value}".format(self, value=minimum))
         else:
             self.warn_min = minimum
 
@@ -99,7 +101,7 @@ class WarningsChecker(object):
         Returns:
             int: Number of warnings found
         '''
-        print("{count} {name} warnings found".format(count=self.count, name=self.name))
+        print("{0.count} {0.name} warnings found".format(self))
         return self.count
 
     def return_check_limits(self):
@@ -109,14 +111,15 @@ class WarningsChecker(object):
             int: 0 if the amount of warnings is within limits. the count of warnings otherwise
         '''
         if self.count > self.warn_max:
-            print("Number of warnings ({count}) is higher than the maximum limit ({max}). Returning error code 1.".format(count=self.count, max=self.warn_max))
+            print("Number of warnings ({0.count}) is higher than the maximum limit ({0.warn_max}). "
+                  "Returning error code 1.".format(self))
             return self.count
-        elif self.count < self.warn_min:
-            print("Number of warnings ({count}) is lower than the minimum limit ({min}). Returning error code 1.".format(count=self.count, min=self.warn_min))
+        if self.count < self.warn_min:
+            print("Number of warnings ({0.count}) is lower than the minimum limit ({0.warn_min}). "
+                  "Returning error code 1.".format(self))
             return self.count
-        else:
-            print("Number of warnings ({count}) is between limits {min} and {max}. Well done.".format(count=self.count, min=self.warn_min, max=self.warn_max))
-            return 0
+        print("Number of warnings ({0.count}) is between limits {0.warn_min} and {0.warn_max}. Well done.".format(self))
+        return 0
 
 
 class RegexChecker(WarningsChecker):
@@ -212,4 +215,3 @@ class CoverityChecker(RegexChecker):
                 self.count += 1
                 if self.verbose:
                     print(match.group(0).strip())
-

diff --git a/tests/test_config.py b/tests/test_config.py
index 1091f48..c441659 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -5,7 +5,7 @@ from mlx.warnings import WarningsPlugin, SphinxChecker, DoxyChecker, JUnitChecke
 
 class TestConfig(TestCase):
     def test_configfile_parsing(self):
-        warnings = WarningsPlugin(configfile="tests/config_example.json")
+        warnings = WarningsPlugin(config_file="tests/config_example.json")
         warnings.check('testfile.c:6: warning: group test: ignoring title "Some test functions" that does not match old title "Some freaky test functions"')
         self.assertEqual(warnings.return_count(), 0)
         warnings.check('<testcase classname="dummy_class" name="dummy_name"><failure message="some random message from test case" /></testcase>')

Plantuml not found
I guess we missed the warning inside the CI (there we go for not dogfooding) for Sphinx

```
WARNING: plantuml command 'plantuml' cannot be run
```

We install sphinxcontrib-plantuml, but dont install plantuml itself I would assume. Needs investigation.
tests/test_config.py::TestConfig::test_configfile_parsing
tests/test_config.py::TestConfig::test_all_config_max tests/test_config.py::TestConfig::test_all_config_min tests/test_config.py::TestConfig::test_doxy_junit_options_config_parsing tests/test_config.py::TestConfig::test_doxygen_config_max tests/test_config.py::TestConfig::test_doxygen_config_min tests/test_config.py::TestConfig::test_junit_config_max tests/test_config.py::TestConfig::test_junit_config_min tests/test_config.py::TestConfig::test_partial_doxygen_config_parsing tests/test_config.py::TestConfig::test_partial_junit_config_parsing tests/test_config.py::TestConfig::test_partial_sphinx_config_parsing tests/test_config.py::TestConfig::test_partial_xmlrunner_config_parsing tests/test_config.py::TestConfig::test_sphinx_config_max tests/test_config.py::TestConfig::test_sphinx_config_min tests/test_config.py::TestConfig::test_sphinx_doxy_config_parsing tests/test_config.py::TestConfig::test_xmlrunner_config_max tests/test_config.py::TestConfig::test_xmlrunner_config_min