diff --git a/main b/main
index 5cbd703..c856ad0 100755
--- a/main
+++ b/main
@@ -20,5 +20,5 @@ if __name__ == '__main__':
         init.load_configuration()
         sherpa()
     except Exception:
-        logging.critical("unhandled exception", exc_info=True)
+        logging.critical('unhandled exception', exc_info=True)
         raise
diff --git a/src/acl.py b/src/acl.py
index c470417..ae397b0 100644
--- a/src/acl.py
+++ b/src/acl.py
@@ -6,11 +6,15 @@
 import re
 from jinja2 import Template
 
+CONST_CONFIG_FILENAME_SIZE = 6
+
 class ACL:
-    def __init__(self, mode):
-        self._config = json.loads(open('/opt/sherpa/config.json', 'r').read())
+    def __init__(self, mode):    
+        with open('/opt/sherpa/config.json', 'r') as conf, open('/opt/sherpa/templates/nginx-acl.tmpl.conf', 'r') as template:
+            self._config = json.loads(conf.read())
+            self._template = Template(template.read())
+
         self._allow = True if mode is 'allow' else False
-        self._template = Template(open('/opt/sherpa/templates/nginx-acl.tmpl.conf', 'r').read())
         self._default_allowed_methods = ['OPTIONS', 'GET', 'HEAD', 'POST', 'PUT', 'DELETE']
         self._parse_mode()
         self._generate_paths()
@@ -19,23 +23,22 @@ def __init__(self, mode):
     def _parse_mode(self):
         default_config = self._template.render(allow=self._allow, path='/', allowed_methods=self._default_allowed_methods, compare='all')
         # create the default config
-        f = open('/etc/nginx/conf.d/default.conf', 'w+')
-        f.write(default_config)
+        with open('/etc/nginx/conf.d/default.conf', 'w+') as f:
+            f.write(default_config)
         
 
     def _generate_paths(self):
         for acl in self._config:
             access = True if acl['Access'] == 'allow' else False
             path = re.sub(r'\*', r'.*', acl['Path'])
-            compare = 'regex' if '*' in path else 'exact'
             methods = self._default_allowed_methods if 'Methods' not in acl else acl['Methods']
             
-            random_name = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(6))
+            random_name = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(CONST_CONFIG_FILENAME_SIZE))
 
-            config = self._template.render(allow=access, path=path, allowed_methods=methods, exact=True, compare=compare)
+            config = self._template.render(allow=access, path=path, allowed_methods=methods, exact=True, compare=('regex' if '*' in path else 'exact'))
             
             # create configs
-            f = open('/etc/nginx/conf.d/{}.conf'.format(random_name), 'w+')
-            f.write(config)
+            with open('/etc/nginx/conf.d/{}.conf'.format(random_name), 'w+') as f:
+                f.write(config)
 
 
diff --git a/src/nginx.py b/src/nginx.py
index b1b7893..9973be5 100644
--- a/src/nginx.py
+++ b/src/nginx.py
@@ -7,7 +7,7 @@ def __init__(self):
 
     def _parse_output(self, process):
         for line in iter(process.stdout.readline, b''):
-            log = line.decode("utf-8");
+            log = line.decode('utf-8')
             print(log)
 
     def _start_nginx(self):