diff --git a/build.sla b/build.sla
index cb1ae2a..4b2087c 100644
--- a/build.sla
+++ b/build.sla
@@ -22,7 +22,7 @@ test () {
 
     # Code quality linting (pylint)
     cd $ROOTDIR
-    cd src && pylint --reports=n -dR -d star-args -d no-member *.py || true
+    cd src && pylint --reports=n -dR -d subprocess-popen-preexec-fn -d invalid-name -d star-args -d no-member *.py || true
     cd $ROOTDIR
 }
 
diff --git a/src/daemon.py b/src/daemon.py
index e2264e6..747ac03 100644
--- a/src/daemon.py
+++ b/src/daemon.py
@@ -15,7 +15,6 @@ class DaemonError(Exception):
     """
     Default error for Daemon class.
     """
-    pass
 
 
 class Daemon(object):  # pragma: no cover
@@ -97,7 +96,8 @@ class Daemon(object):  # pragma: no cover
             return None
 
         try:
-            pid = int(file(self.pid_file, 'r').read().strip())
+            with open(self.pid_file, "r") as fh:
+                pid = int(fh.read().strip())
         except ValueError:
             return None
 
@@ -137,9 +137,8 @@ class Daemon(object):  # pragma: no cover
         pid = os.fork()
         if pid > 0:
             self.log.info("PID = %s", pid)
-            pidfile = file(self.pid_file, 'w')
-            pidfile.write(str(pid))
-            pidfile.close()
+            with open(self.pid_file, "w") as fh:
+                fh.write(str(pid))
             sys.exit(0)  # End parent
 
         atexit.register(self._cleanup)
diff --git a/src/formconfig.py b/src/formconfig.py
index cc9f3a6..a3c26e5 100644
--- a/src/formconfig.py
+++ b/src/formconfig.py
@@ -13,7 +13,6 @@ class FormConfigError(Exception):
     """
     Default error for FormConfig errors
     """
-    pass
 
 
 class FormConfig(object):
diff --git a/src/formdefinition.py b/src/formdefinition.py
index 7def906..4e0e7aa 100644
--- a/src/formdefinition.py
+++ b/src/formdefinition.py
@@ -10,8 +10,9 @@ import runscript
 
 
 class ValidationError(Exception):
-    """Default exception for Validation errors"""
-    pass
+    """
+    Default exception for Validation errors
+    """
 
 
 class FormDefinition(object):
diff --git a/src/scriptform.py b/src/scriptform.py
index 843d325..0767400 100755
--- a/src/scriptform.py
+++ b/src/scriptform.py
@@ -12,7 +12,6 @@ import json
 import logging
 import threading
 import hashlib
-import socket
 
 if hasattr(sys, 'dont_write_bytecode'):
     sys.dont_write_bytecode = True
@@ -68,7 +67,8 @@ class ScriptForm(object):
         if 'static_dir' in config:
             static_dir = config['static_dir']
         if 'custom_css' in config:
-            custom_css = file(config['custom_css'], 'r').read()
+            with open(config["custom_css"], "r") as fh:
+                custom_css = fh.read()
         if 'users' in config:
             users = config['users']
         for form in config['forms']:
@@ -186,10 +186,11 @@ def main():  # pragma: no cover
         if plain_pw != getpass.getpass('Repeat password: '):
             sys.stderr.write("Passwords do not match.\n")
             sys.exit(1)
-        sys.stdout.write(hashlib.sha256(plain_pw.encode('utf8')).hexdigest() + '\n')
+        sha = hashlib.sha256(plain_pw.encode('utf8')).hexdigest()
+        sys.stdout.write("{}\n".format(sha))
         sys.exit(0)
     else:
-        if not options.action_stop and len(args) < 1:
+        if not options.action_stop and not args:
             parser.error("Insufficient number of arguments")
         if not options.action_stop and not options.action_start:
             options.action_start = True
diff --git a/src/webapp.py b/src/webapp.py
index 45b25a2..bb0e5ab 100644
--- a/src/webapp.py
+++ b/src/webapp.py
@@ -3,7 +3,6 @@ The webapp part of Scriptform, which takes care of serving requests and
 handling them.
 """
 
-import cgi
 import html
 import logging
 import tempfile
@@ -214,7 +213,8 @@ class ScriptFormWebApp(RequestHandler):
             if auth_header is not None:
                 # Validate the username and password
                 auth_unpw = auth_header.split(' ', 1)[1].encode('utf-8')
-                username, password = base64.b64decode(auth_unpw).decode('utf-8').split(":", 1)
+                username, password = \
+                    base64.b64decode(auth_unpw).decode('utf-8').split(":", 1)
                 pw_hash = hashlib.sha256(password.encode('utf-8')).hexdigest()
                 if username in form_config.users and \
                    pw_hash == form_config.users[username]:
diff --git a/src/webserver.py b/src/webserver.py
index 276efb1..76d38b7 100644
--- a/src/webserver.py
+++ b/src/webserver.py
@@ -29,7 +29,6 @@ class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
     """
     Base class for multithreaded HTTP servers.
     """
-    pass
 
 
 class RequestHandler(BaseHTTPRequestHandler):