suricatasc: Get rid of issues detected by Pylint

Pylint is a tool to make sure we do not regress the support for Python
3. The following conventions, warnings, errors, refactors have been
fixed.

C0326: Exactly one space required around assignment
C0326: No space allowed around keyword argument assignment
C0325: Unnecessary parens after 'if' keyword
W0301: Unnecessary semicolon
W0702: No exception type(s) specified
W0231: __init__ method from base class 'Exception' is not called
W0107: Unnecessary pass statement
C0121: Comparison to None should be 'expr is not None'
E0602: Undefined variable 'raw_input'
W0201: Attribute 'socket' defined outside __init__
W0611: Unused import

python/suricata/sc/suricatasc.py

@@ -16,12 +16,10 @@
 
 try:
     import simplejson as json
-except:
+except ImportError:
     import json
-import re
 import readline
 from socket import socket, AF_UNIX, error
-from time import sleep
 import select
 import sys
 
@@ -30,33 +28,35 @@ SURICATASC_VERSION = "1.0"
 VERSION = "0.2"
 INC_SIZE = 1024
 
+
 class SuricataException(Exception):
     """
     Generic class for suricatasc exception
     """
     def __init__(self, value):
+        super(SuricataException, self).__init__(value)
         self.value = value
 
     def __str__(self):
         return str(self.value)
 
+
 class SuricataNetException(SuricataException):
     """
     Exception raised when network error occur.
     """
-    pass
+
 
 class SuricataCommandException(SuricataException):
     """
     Exception raised when command is not correct.
     """
-    pass
+
 
 class SuricataReturnException(SuricataException):
     """
     Exception raised when return message is not correct.
     """
-    pass
 
 
 class SuricataCompleter:
@@ -80,9 +80,10 @@ class SuricataCompleter:
 
 class SuricataSC:
     def __init__(self, sck_path, verbose=False):
-        self.cmd_list=['shutdown','quit','pcap-file','pcap-file-continuous','pcap-file-number','pcap-file-list','pcap-last-processed','pcap-interrupt','iface-list','iface-stat','register-tenant','unregister-tenant','register-tenant-handler','unregister-tenant-handler', 'add-hostbit', 'remove-hostbit', 'list-hostbit', 'memcap-set', 'memcap-show']
+        self.cmd_list = ['shutdown', 'quit', 'pcap-file', 'pcap-file-continuous', 'pcap-file-number', 'pcap-file-list', 'pcap-last-processed', 'pcap-interrupt', 'iface-list', 'iface-stat', 'register-tenant', 'unregister-tenant', 'register-tenant-handler', 'unregister-tenant-handler', 'add-hostbit', 'remove-hostbit', 'list-hostbit', 'memcap-set', 'memcap-show']
         self.sck_path = sck_path
         self.verbose = verbose
+        self.socket = socket(AF_UNIX)
 
     def json_recv(self):
         cmdret = None
@@ -97,13 +98,13 @@ class SuricataSC:
                 break
         return cmdret
 
-    def send_command(self, command, arguments = None):
+    def send_command(self, command, arguments=None):
         if command not in self.cmd_list and command != 'command-list':
             raise SuricataCommandException("No such command: %s", command)
 
         cmdmsg = {}
         cmdmsg['command'] = command
-        if (arguments != None):
+        if arguments:
             cmdmsg['arguments'] = arguments
         if self.verbose:
             print("SND: " + json.dumps(cmdmsg))
@@ -119,7 +120,7 @@ class SuricataSC:
         else:
             cmdret = None
 
-        if cmdret == None:
+        if not cmdret:
             raise SuricataReturnException("Unable to get message from server")
 
         if self.verbose:
@@ -129,7 +130,6 @@ class SuricataSC:
 
     def connect(self):
         try:
-            self.socket = socket(AF_UNIX)
             self.socket.connect(self.sck_path)
         except error as err:
             raise SuricataNetException(err)
@@ -149,7 +149,7 @@ class SuricataSC:
         else:
             cmdret = None
 
-        if cmdret == None:
+        if not cmdret:
             raise SuricataReturnException("Unable to get message from server")
 
         if self.verbose:
@@ -193,11 +193,11 @@ class SuricataSC:
                     arguments = {}
                     arguments["filename"] = filename
                     arguments["output-dir"] = output
-                    if tenant != None:
+                    if tenant:
                         arguments["tenant"] = int(tenant)
-                    if continuous != None:
+                    if continuous:
                         arguments["continuous"] = continuous
-                    if delete_when_done != None:
+                    if delete_when_done:
                         arguments["delete-when-done"] = delete_when_done
             elif "pcap-file-continuous " in command:
                 try:
@@ -218,9 +218,9 @@ class SuricataSC:
                     arguments["filename"] = filename
                     arguments["output-dir"] = output
                     arguments["continuous"] = True
-                    if tenant != None:
+                    if tenant:
                         arguments["tenant"] = int(tenant)
-                    if delete_when_done != None:
+                    if delete_when_done:
                         arguments["delete-when-done"] = delete_when_done
             elif "iface-stat" in command:
                 try:
@@ -257,7 +257,7 @@ class SuricataSC:
                     arguments = {}
                     arguments["id"] = int(tenantid)
                     arguments["htype"] = htype
-                    if hargs != None:
+                    if hargs:
                         arguments["hargs"] = int(hargs)
             elif "register-tenant-handler" in command:
                 try:
@@ -274,7 +274,7 @@ class SuricataSC:
                     arguments = {}
                     arguments["id"] = int(tenantid)
                     arguments["htype"] = htype
-                    if hargs != None:
+                    if hargs:
                         arguments["hargs"] = int(hargs)
             elif "unregister-tenant" in command:
                 try:
@@ -380,7 +380,7 @@ class SuricataSC:
                 else:
                     command = input(">>> ").strip()
                 if command == "quit":
-                    break;
+                    break
                 try:
                     (cmd, arguments) = self.parse_command(command)
                 except SuricataCommandException as err: