diff --git a/apps/click2dial/example.py b/apps/click2dial/example.py
index 8548d463..fc3d7a70 100644
--- a/apps/click2dial/example.py
+++ b/apps/click2dial/example.py
@@ -10,6 +10,8 @@
 # of the R-Uri to correctly route it to the destination.
 ########################################################################
 
+from xmlrpclib import *
+
 proxy = "192.168.100.10"
 xmlrpc_url = "http://127.0.0.1:8090"
 
@@ -24,12 +26,11 @@ auth_realm = "iptel.org"
 
 announce_file = "default_en"
 
-from xmlrpclib import *
 s = ServerProxy(xmlrpc_url)
 s.dial_auth_b2b(
-        "click2dial", announce_file, 
-        "sip:" + caller_user + "@" + caller_domain, 
-        "sip:" + callee_user + "@" + callee_domain, 
+        "click2dial", announce_file,
+        "sip:" + caller_user + "@" + caller_domain,
+        "sip:" + callee_user + "@" + callee_domain,
         "sip:" + caller_user + "@" + proxy + ";sw_domain=" + caller_domain,
         "sip:" + callee_user + "@" + proxy + ";sw_domain=" + callee_domain,
         auth_realm, auth_user, auth_pass)
diff --git a/apps/conf_auth/conf_auth.py b/apps/conf_auth/conf_auth.py
index 3a1ef2dd..ec8d5965 100644
--- a/apps/conf_auth/conf_auth.py
+++ b/apps/conf_auth/conf_auth.py
@@ -20,11 +20,13 @@ connected  = 2
 HINT_TIMER   = 1
 CONF_TIMER   = 2
 
+
 def loopedTTS(str):
 	af = IvrAudioFile.tts(str)
 	af.loop = True
 	return af
 
+
 class IvrDialog(IvrDialogBase):
 	welcome_msg   = None
 	auth_ok_msg   = None
@@ -37,7 +39,7 @@ class IvrDialog(IvrDialogBase):
 	conf_to = ''
 	conf_uri = ''
 	conf_duration = 0
-		
+
 	def sessionInfo(self):
 		print("IVR Session info:")
 		print(" user:        ", self.dialog.user)
@@ -59,7 +61,7 @@ class IvrDialog(IvrDialogBase):
 	def onSessionStart(self):
 		self.sessionInfo()
 		self.setNoRelayonly()
-		self.welcome_msg = IvrAudioFile.tts("Welcome to the conferencing server. "+ \
+		self.welcome_msg = IvrAudioFile.tts("Welcome to the conferencing server. " +
 						"Please enter your PIN number, followed by the star key.")
 		self.auth_ok_msg = IvrAudioFile.tts("Your PIN number is correct, you will be connected now.")
 #		self.auth_fail_msg = IvrAudioFile.tts("Sorry, you have entered an invalid PIN number. " + \
@@ -68,22 +70,22 @@ class IvrDialog(IvrDialogBase):
 
 		self.enqueue(self.welcome_msg,None)
 
-	def onBye(self):		
+	def onBye(self):
 		self.stopSession()
 
 	def onDtmf(self,key,duration):
 		if self.state == collect:
 			self.flush()
 			if key == 10:
-	
+
 				c = xmlrpclib.ServerProxy(server_path )
-				erg = c.AuthorizeConference(self.dialog.remote_uri, 
+				erg = c.AuthorizeConference(self.dialog.remote_uri,
 									self.dialog.local_party, self.keys)
 
 				debug('result of authentication: '+ str(erg))
 				if erg[0] == 'OK':
 					self.flush()
-					self.enqueue(self.auth_ok_msg, None)				
+					self.enqueue(self.auth_ok_msg, None)
 					self.conf_to = erg[1]
 					self.conf_uri = erg[2]
 					self.conf_duration = erg[3]
@@ -95,9 +97,9 @@ class IvrDialog(IvrDialogBase):
 					self.auth_fail_msg.open(erg[1], ivr.AUDIO_READ)
 					#self.flush()
 					self.enqueue(self.auth_fail_msg, None)
-					
+
 					self.setTimer(HINT_TIMER,  HINT_TIMEOUT)
-			else: 
+			else:
 				self.keys += str(key)
 				debug("added key, PIN = " + self.keys)
 				self.setTimer(HINT_TIMER,  HINT_TIMEOUT)
@@ -123,4 +125,3 @@ class IvrDialog(IvrDialogBase):
 			self.terminateOtherLeg()
 			self.bye()
 			self.stopSession()
-	
diff --git a/apps/examples/db_announce/announcement.py b/apps/examples/db_announce/announcement.py
index dec79532..9371ee31 100644
--- a/apps/examples/db_announce/announcement.py
+++ b/apps/examples/db_announce/announcement.py
@@ -11,7 +11,8 @@
 # Use, copying, modification, and distribution without written
 # permission is not allowed.
 
-import os, MySQLdb
+import os
+import MySQLdb
 
 from log import *
 from ivr import *
diff --git a/apps/examples/ivr_examples/b2b_out.py b/apps/examples/ivr_examples/b2b_out.py
index 988f6f71..4f322a61 100644
--- a/apps/examples/ivr_examples/b2b_out.py
+++ b/apps/examples/ivr_examples/b2b_out.py
@@ -1,15 +1,17 @@
-# (outgoing) ivr b2bua example
 #
+# (outgoing) ivr b2bua example
 #
+
 from log import *
 from ivr import *
 
+
 class IvrDialog(IvrDialogBase):
-    
+
     def onSessionStart(self):
 
         info("starting b2bua app ...")
-        self.setNoRelayonly()        
+        self.setNoRelayonly()
         self.audio_msg = IvrAudioFile()
         self.audio_msg.open("/home/stefan/sub_nautilus.wav", AUDIO_READ)
         self.setTimer(1, 10)
@@ -21,10 +23,10 @@ class IvrDialog(IvrDialogBase):
     def onTimer(self, timerid):
         self.disconnectMedia()
         debug('hello kitty')
-        self.connectCallee(self.dialog.local_party,self.dialog.local_uri, \
+        self.connectCallee(self.dialog.local_party, self.dialog.local_uri,
                            self.dialog.remote_party,self.dialog.remote_uri,)
         return
 
-    def onBye(self):		
+    def onBye(self):
 
         self.stopSession()
diff --git a/apps/examples/ivr_examples/b2bua.py b/apps/examples/ivr_examples/b2bua.py
index 77951f51..a6e4cd01 100644
--- a/apps/examples/ivr_examples/b2bua.py
+++ b/apps/examples/ivr_examples/b2bua.py
@@ -1,26 +1,28 @@
-# 
+#
 # ivr b2bua script example
 #
+
 from log import *
 from ivr import *
 
 WELLCOME_MSG = "wav/default_en.wav"
 CALLEE_URI = "sip:music@iptel.org"
 
+
 class IvrDialog(IvrDialogBase):
-    
+
     def onSessionStart(self):
 
         info("starting b2bua test ...")
 
         self.setNoRelayonly()
-        
+
         self.welcome_msg = IvrAudioFile()
         self.welcome_msg.open(WELLCOME_MSG, AUDIO_READ)
         self.enqueue(self.welcome_msg,None)
 
     def onEmptyQueue(self):
-        
+
         info("connecting to To: " + CALLEE_URI + " R-URI: " + CALLEE_URI)
         info("\n\n\n original headers are: ---->%s<----\n\n\n" % self.invite_req.hdrs)
         self.invite_req.hdrs += "P-SomeMoreFunky: headervalue\r\n"
@@ -32,5 +34,5 @@ class IvrDialog(IvrDialogBase):
 
         return
 
-    def onBye(self):		
+    def onBye(self):
         self.stopSession()
diff --git a/apps/examples/ivr_examples/call_center.py b/apps/examples/ivr_examples/call_center.py
index 039c76d5..39d09331 100644
--- a/apps/examples/ivr_examples/call_center.py
+++ b/apps/examples/ivr_examples/call_center.py
@@ -16,6 +16,7 @@ beeping                   = 1
 connecting                = 2
 connected                 = 3
 
+
 class IvrDialog(IvrDialogBase):
 
     def onSessionStart(self):
@@ -40,7 +41,7 @@ class IvrDialog(IvrDialogBase):
             return
 
         return
-    
+
     def onOtherReply(self, code, reason):
 
         debug('call_center: got reply: ' + str(code) + ' ' + reason)
diff --git a/apps/examples/ivr_examples/db_balance.py b/apps/examples/ivr_examples/db_balance.py
index f1041f26..b424f21c 100644
--- a/apps/examples/ivr_examples/db_balance.py
+++ b/apps/examples/ivr_examples/db_balance.py
@@ -4,7 +4,7 @@
 # mysql> create database business;
 # mysql> create table business.accounts (user VARCHAR(100), bal_int INT, bal_decimal INT);
 #
-# set TTS=y in apps/ivr/Makefile.defs, or rewrite with 
+# set TTS=y in apps/ivr/Makefile.defs, or rewrite with
 # enqueuing the parts of the sentence, like
 #  self.ttsfile1 = IvrAudioFile()
 #  self.ttsfile1.open("your_account_balance.wav", AUDIO_READ)
@@ -23,6 +23,7 @@ db = MySQLdb.connection(host="127.0.0.1", user="root", passwd="sa07", db="busine
 # or, when using config file db_balance.conf:
 #db = MySQLdb.connection(host=config["db_host"], user=config["db_user"], passwd=config["db_pwd"], db=config["db_db"])
 
+
 class IvrDialog(IvrDialogBase) :
     ttsfile = None
 
@@ -30,13 +31,13 @@ class IvrDialog(IvrDialogBase) :
         db.query("select bal_int, bal_decimal from accounts where user='%s'" % self.dialog.user)
         r = db.store_result()
         res = r.fetch_row(1)
-        if len(res):            
-            self.ttsfile = IvrAudioFile().tts("Your account balance is %i dollars and %i cents" % \
+        if len(res):
+            self.ttsfile = IvrAudioFile().tts("Your account balance is %i dollars and %i cents" %
                                                   (int(res[0][0]), int(res[0][1])))
         else:
             self.ttsfile = IvrAudioFile().tts("Sorry, I do not know your account balance.")
         self.enqueue(self.ttsfile, None)
-    
+
     def onEmptyQueue(self):
         self.bye()
         self.stopSession()
diff --git a/apps/examples/ivr_examples/play.py b/apps/examples/ivr_examples/play.py
index 93a1eed1..e145bfdc 100644
--- a/apps/examples/ivr_examples/play.py
+++ b/apps/examples/ivr_examples/play.py
@@ -6,6 +6,7 @@ from log import *
 from ivr import *
 from p_app_param.p_app_param import *
 
+
 class IvrDialog(IvrDialogBase):
 
     def onInvite(self, hdrs):
@@ -19,20 +20,20 @@ class IvrDialog(IvrDialogBase):
         if not self.file:
             self.file = "/tmp/default.wav"
         return True
-            
+
     def onSessionStart(self):
         self.announcement = IvrAudioFile()
         self.announcement.open(self.file, ivr.AUDIO_READ, False)
         self.enqueue(self.announcement, None)
         return
-        
+
     def onEmptyQueue(self):
         if not self.queueIsEmpty():
             return
         self.bye()
         self.stopSession()
         return
-    
+
     def onBye(self):
         self.stopSession()
         return
diff --git a/apps/examples/ivr_examples/rec.py b/apps/examples/ivr_examples/rec.py
index 2485f005..852da2de 100644
--- a/apps/examples/ivr_examples/rec.py
+++ b/apps/examples/ivr_examples/rec.py
@@ -1,9 +1,11 @@
 #
 # just recording to file
 #
+
 from log import *
 from ivr import *
 
+
 class IvrDialog(IvrDialogBase) :
 
     def onSessionStart(self) :
diff --git a/apps/examples/ivr_examples/test_mp3.py b/apps/examples/ivr_examples/test_mp3.py
index c8e0156e..4326d5c8 100644
--- a/apps/examples/ivr_examples/test_mp3.py
+++ b/apps/examples/ivr_examples/test_mp3.py
@@ -4,6 +4,8 @@
 
 from log import *
 from ivr import *
+
+
 class IvrDialog(IvrDialogBase):
 
 	def onSessionStart(self):
@@ -12,4 +14,3 @@ class IvrDialog(IvrDialogBase):
 		self.enqueue(self.voice_msg, None)
 		self.voice_msg.open("record.mp3", AUDIO_WRITE, False)
 		self.enqueue(None, self.voice_msg)
-
diff --git a/apps/examples/ivr_examples/tmpfile.py b/apps/examples/ivr_examples/tmpfile.py
index f2d63bfb..841683a2 100644
--- a/apps/examples/ivr_examples/tmpfile.py
+++ b/apps/examples/ivr_examples/tmpfile.py
@@ -1,10 +1,12 @@
 #
 # using IvrAudioFile fpopen
 #
+
 from log import *
 from ivr import *
 import os
 
+
 class IvrDialog(IvrDialogBase):
 
 	def onSessionStart(self):
diff --git a/apps/examples/mixin_announce/mix_announce.py b/apps/examples/mixin_announce/mix_announce.py
index fc38199a..7b39be79 100644
--- a/apps/examples/mixin_announce/mix_announce.py
+++ b/apps/examples/mixin_announce/mix_announce.py
@@ -2,6 +2,7 @@
 from log import *
 from ivr import *
 
+
 class IvrDialog(IvrDialogBase):
 	mixin = None
 	announcement = None
diff --git a/apps/examples/py_sems_ex/early_media.py b/apps/examples/py_sems_ex/early_media.py
index b170037b..41da9112 100644
--- a/apps/examples/py_sems_ex/early_media.py
+++ b/apps/examples/py_sems_ex/early_media.py
@@ -1,4 +1,7 @@
-import base64, time, os, sip
+import base64
+import time
+import os
+import sip
 
 from py_sems_log import *
 from py_sems import *
@@ -37,7 +40,7 @@ class PySemsScript(PySemsDialog):
 
             if self.dlg.reply(req, 183, "OK", "application/sdp", sdp_reply, "") != 0:
                 self.setStopped()
-        except:
+        except Exception:
             self.dlg.reply(req, 500, "File not found", "", "", "")
             self.ann = None
             self.setStopped()
@@ -100,7 +103,7 @@ class PySemsScript(PySemsDialog):
                     code_i = int(code)
                     if (code_i < 300) or (code_i > 699):
                         debug("Invalid reply code: %d", code_i)
-                except:
+                except Exception:
                     debug("Invalid reply code: %s", code)
 
                 debug("Replying %d %s" % (code_i, reason))
diff --git a/apps/examples/py_sems_ex/jukecall.py b/apps/examples/py_sems_ex/jukecall.py
index 24ac3f34..d10096c1 100644
--- a/apps/examples/py_sems_ex/jukecall.py
+++ b/apps/examples/py_sems_ex/jukecall.py
@@ -1,4 +1,7 @@
-import base64, time, os, sip
+import base64
+import time
+import os
+import sip
 
 from py_sems_log import *
 from py_sems import *
@@ -49,7 +52,7 @@ class PySemsScript(PySemsB2ABDialog):
         self.ann = AmAudioFile()
         try:
             self.ann.open(ann_file)
-        except:
+        except Exception:
             self.dlg.reply(req, 500, "File not found", "", "", "")
             self.ann = None
             self.setStopped()
diff --git a/apps/examples/tutorial/annc_service/annc_service.py b/apps/examples/tutorial/annc_service/annc_service.py
index 0d39a5e1..63f66f8d 100644
--- a/apps/examples/tutorial/annc_service/annc_service.py
+++ b/apps/examples/tutorial/annc_service/annc_service.py
@@ -1,5 +1,5 @@
 #
-# Simple implementation of (a part) of RFC4240 
+# Simple implementation of (a part) of RFC4240
 # announcement service.
 #
 # supported parameters:
@@ -15,6 +15,7 @@ from os import unlink
 TIMEOUT_TIMER_ID = 1
 DELAY_TIMER_ID   = 2
 
+
 class IvrDialog(IvrDialogBase):
 
 	announcement=None
@@ -23,13 +24,13 @@ class IvrDialog(IvrDialogBase):
 	delay=0
 	duration=-1
 	play=""
-	delete_onbye = False	
+	delete_onbye = False
 	repeat_left = 0
 
 	def onSessionStart(self,hdrs):
 
 		debug("configuration: %s" % repr(config))
-		debug("local_uri = " + self.dialog.local_uri);
+		debug("local_uri = " + self.dialog.local_uri)
 		# we use urlsplit as urlparse only returns the
 		# parameters of the last path
 		params = urlsplit(self.dialog.local_uri)[2].split(";")
diff --git a/apps/examples/tutorial/cc_acc_xmlrpc/server/xmlrpcserver.py b/apps/examples/tutorial/cc_acc_xmlrpc/server/xmlrpcserver.py
index 365633fe..0617e627 100644
--- a/apps/examples/tutorial/cc_acc_xmlrpc/server/xmlrpcserver.py
+++ b/apps/examples/tutorial/cc_acc_xmlrpc/server/xmlrpcserver.py
@@ -6,6 +6,7 @@ import string
 server = SimpleXMLRPCServer(("localhost", 8000))
 server.register_introspection_functions()
 
+
 class MyFuncs:
 	def getCredit(self, arg):
 		print("Function getCredit")
@@ -28,5 +29,6 @@ class MyFuncs:
 		print("                credit: ", credit)
 		return credit
 
+
 server.register_instance(MyFuncs())
 server.serve_forever()
diff --git a/apps/examples/tutorial/ivr_announce/ivr_announce.py b/apps/examples/tutorial/ivr_announce/ivr_announce.py
index a055ce15..d11ed174 100644
--- a/apps/examples/tutorial/ivr_announce/ivr_announce.py
+++ b/apps/examples/tutorial/ivr_announce/ivr_announce.py
@@ -2,6 +2,7 @@
 from log import *
 from ivr import *
 
+
 class IvrDialog(IvrDialogBase):
 	announcement = None
 
diff --git a/apps/ivr/moc/ivr.py b/apps/ivr/moc/ivr.py
index fa658f28..965b95c6 100644
--- a/apps/ivr/moc/ivr.py
+++ b/apps/ivr/moc/ivr.py
@@ -4,9 +4,11 @@ config = dict()
 AUDIO_READ  = 0
 AUDIO_WRITE = 1
 
+
 def getHeader(str1,str2):
 	pass
 
+
 class IvrDialogBase:
 
 	def enqueue(self,a1,a2):
@@ -17,10 +19,11 @@ class IvrDialogBase:
 
 	def bye(self):
 		pass
-	
+
 	def stopSession(self):
 		pass
 
+
 class IvrAudioFile:
 
 	def open(self,filename,mode):
diff --git a/apps/ivr/py/log.py b/apps/ivr/py/log.py
index f5f62b81..4af960eb 100644
--- a/apps/ivr/py/log.py
+++ b/apps/ivr/py/log.py
@@ -7,33 +7,39 @@ L_WARN = 1
 L_INFO = 2
 L_DBG  = 3
 
+
 def log(level, msg, args):
 
-	if args != None:
+	if args is not None:
 		tmp_msg = msg % args
 	else:
 		tmp_msg = msg
-		
+
 	ivr.log(level,"Ivr-Python: " + tmp_msg + "\n")
 
 
 def error(msg, args=None):
 	log(L_ERR, msg, args)
 
+
 def warn(msg, args=None):
 	log(L_WARN, msg, args)
 
+
 def info(msg, args=None):
 	log(L_INFO, msg, args)
-	
+
+
 def debug(msg, args=None):
 	log(L_DBG, msg, args)
 
 
 def stacktrace(tb):
 
-	if tb: last_file = stacktrace(tb.tb_next)
-	else: return
+	if tb:
+		last_file = stacktrace(tb.tb_next)
+	else:
+		return
 
 	f = tb.tb_frame.f_code.co_filename
 	line = tb.tb_frame.f_lineno
@@ -53,7 +59,6 @@ def log_excepthook(exception, value, tb):
 	error('********** end of Ivr-Python exception report *********')
 
 
-
 # init code
 sys.excepthook = log_excepthook
 debug("Python-Ivr logging started")
diff --git a/apps/mailbox/imap_mailbox/MailboxURL.py b/apps/mailbox/imap_mailbox/MailboxURL.py
index c00f05eb..792be352 100644
--- a/apps/mailbox/imap_mailbox/MailboxURL.py
+++ b/apps/mailbox/imap_mailbox/MailboxURL.py
@@ -1,7 +1,8 @@
 
 import re
 
-class InvalidMailboxURL(Exception):	
+
+class InvalidMailboxURL(Exception):
 	def __init__(self,value):
 		self.value = value
 
@@ -11,7 +12,6 @@ class InvalidMailboxURL(Exception):
 
 class MailboxURL:
 
-
 	url    = ""
 	user   = ""
 	passwd = ""
@@ -23,7 +23,6 @@ class MailboxURL:
 		self.url = url
 		self._parse()
 
-
 	def _parse(self):
 		m = re.match('imap://(.+):(.+)@(.+):([0-9]+)/(.+)',self.url)
 		if m is None:
@@ -42,5 +41,3 @@ class MailboxURL:
 		       ("host:\t%s\n" % self.host) + \
 		       ("port:\t%i\n" % self.port) + \
 		       ("path:\t%s\n" % self.path)
-		       
-		
diff --git a/apps/mailbox/imap_mailbox/imap4ext.py b/apps/mailbox/imap_mailbox/imap4ext.py
index f946b4cc..60915732 100644
--- a/apps/mailbox/imap_mailbox/imap4ext.py
+++ b/apps/mailbox/imap_mailbox/imap4ext.py
@@ -1,4 +1,6 @@
-import os,base64,time
+import os
+import base64
+import time
 from imaplib import IMAP4
 
 from MailboxURL import *
@@ -20,7 +22,7 @@ class IMAP4_MsgBODY:
 	uid   = ''
 	parts = []
 	ct    = ''
-		
+
 	def __init__(self,imap,uid):
 
 		self.uid   = ''
@@ -40,16 +42,16 @@ class IMAP4_MsgBODY:
 
 		(t,d) = imap.uid('fetch',self.uid,'(BODY.PEEK[%i])' % (part+1))
 		if (t != "OK") or (len(d[0]) != 2):
-			raise IMAP4.error("could not retrieve part %s/%i" \
+			raise IMAP4.error("could not retrieve part %s/%i"
 					  % (self.uid, part+1))
-			
+
 		msg = d[0][1]
 		msg = base64.decodestring(msg)
 		if filename is None:
 			out_file = os.tmpfile()
 		else:
 			out_file = open(filename,'w+')
-			
+
 		out_file.write(msg)
 		out_file.seek(0)
 
@@ -59,11 +61,10 @@ class IMAP4_MsgBODY:
 			out_file.close()
 			return None
 
-
 	def _parse_body_desc(self,desc):
 
 		(_dummy,s) = self._parenthesis2seq(desc)[1]
-		
+
 		self.uid = s[1]
 
 		if type(s[3][0]) is not str:
@@ -78,7 +79,6 @@ class IMAP4_MsgBODY:
 			self.parts.append(s[3])
 			self.ct = s[3][0]
 
-
 	def _parenthesis2seq(self,s,ibeg=0):
 
 		seq = []
@@ -90,7 +90,7 @@ class IMAP4_MsgBODY:
 				(i,tmp_seq) = self._parenthesis2seq(s,i+1)
 				elmt_beg = i
 				seq.append(tmp_seq)
-			
+
 			elif s[i] == ')':
 				if elmt_beg < i:
 					seq.append(s[elmt_beg:i])
@@ -110,7 +110,6 @@ class IMAP4_MsgBODY:
 		return (i,seq)
 
 
-
 class IMAP4_Mailbox:
 
 	url  = None
@@ -123,25 +122,22 @@ class IMAP4_Mailbox:
 
 	def __del__(self):
 
-		if self.imap != None:
+		if self.imap is not None:
 			self.imap.logout()
 			self.imap = None
-		
 
 	def createBox(self):
 
 		self._login()
-		debug("Creating account: " + \
+		debug("Creating account: " +
 		      repr(IMAPCALL(self.imap.create(self.url.path))))
 
-
 	def deleteBox(self):
 
 		self._login()
-		debug("Deleting account: " + \
+		debug("Deleting account: " +
 		      repr(IMAPCALL(self.imap.delete(self.url.path))))
 
-
 	def uploadMsg(self,msg):
 		self._login()
 		IMAPCALL(self.imap.append(self.url.path,None,time.gmtime(),msg))
@@ -179,9 +175,8 @@ class IMAP4_Mailbox:
 		IMAPCALL(self.imap.close())
 		return msg_list
 
-
 	def downloadWAV(self,msg_uid):
-		
+
 		self._login()
 		IMAPCALL(self.imap.select(self.url.path))
 		body = IMAP4_MsgBODY(self.imap,msg_uid)
@@ -194,13 +189,12 @@ class IMAP4_Mailbox:
 
 		IMAPCALL(self.imap.close())
 		return fp
-		
 
 	def downloadWAVs(self,search_criterion,file_prefix):
 
 		self._login()
 		IMAPCALL(self.imap.select(self.url.path))
-		
+
 		(t,d) = self.imap.uid('SEARCH',search_criterion)
 		IMAPCALL((t,d))
 
@@ -208,27 +202,26 @@ class IMAP4_Mailbox:
 		for i in d[0].split():
 
 			body = IMAP4_MsgBODY(self.imap,i)
-		
+
 			for p in range(len(body.parts)):
-			
+
 				if body.part_ct(p).upper() == 'AUDIO/X-WAV':
-					
+
 					filename = file_prefix + '-' + body.uid + '.wav'
 					msg_list.append(filename)
 					body.fetch2file(self.imap,p,filename)
-					
+
 		IMAPCALL(self.imap.close())
 		return msg_list
 
 	def _login(self):
 
-		if self.imap != None:
+		if self.imap is not None:
 			return
 
 		self.imap = IMAP4(self.url.host,self.url.port)
 		try:
 			IMAPCALL(self.imap.login(self.url.user,self.url.passwd))
-		except:
+		except IMAP4.error:
 			self.imap = None
 			raise
-		
diff --git a/apps/mailbox/mailbox.py b/apps/mailbox/mailbox.py
index d4aa00ab..0992dcb0 100644
--- a/apps/mailbox/mailbox.py
+++ b/apps/mailbox/mailbox.py
@@ -1,4 +1,5 @@
-import base64,time
+import base64
+import time
 
 from log import *
 from ivr import *
@@ -16,7 +17,7 @@ class IvrDialog(IvrDialogBase):
 	def onSessionStart(self):
 
 		debug("config: %s" % repr(config))
-		self.mailbox = IMAP4_Mailbox(getAppParam("Mailbox-URL"));
+		self.mailbox = IMAP4_Mailbox(getAppParam("Mailbox-URL"))
 		debug("***** Mailbox Url: ******\n" + str(self.mailbox.url))
 
 		self.announcement = IvrAudioFile()
@@ -32,27 +33,21 @@ class IvrDialog(IvrDialogBase):
 		self.enqueue(self.announcement,None)
 		self.enqueue(self.beep,None)
 		self.enqueue(None,self.voice_msg)
-		
-		
+
 	def onBye(self):
-		
+
 		self.stopSession()
 		self.saveMsg()
 
-
 	def onEmptyQueue(self):
 
-		
-
 		self.bye()
 		self.stopSession()
 		self.saveMsg()
 
-
 	def onDtmf(self,key,duration):
-		
-		pass
 
+		pass
 
 	def saveMsg(self):
 
@@ -71,5 +66,5 @@ class IvrDialog(IvrDialogBase):
 		      enc_msg
 
 		#debug("msg = <%s>",msg);
-		
+
 		self.mailbox.uploadMsg(msg)
diff --git a/apps/mailbox/mailbox_query.py b/apps/mailbox/mailbox_query.py
index 14e5b929..b99c1241 100644
--- a/apps/mailbox/mailbox_query.py
+++ b/apps/mailbox/mailbox_query.py
@@ -1,4 +1,5 @@
-import os,weakref
+import os
+import weakref
 
 from log import *
 from ivr import *
@@ -18,34 +19,28 @@ class VoiceMsg:
 		self._mb    = mb
 		self._audio = None
 
-
 	def _load(self):
 
 		self._fp    = self._mb.downloadWAV(self._uid)
 		self._audio = IvrAudioFile()
 		self._audio.fpopen("tmp.wav",AUDIO_READ,self._fp)
 
-
 	def audio(self):
 
-		if self._audio == None:
+		if self._audio is None:
 			self._load()
-			
-		return self._audio
 
+		return self._audio
 
 	def save(self):
 
 		self._mb.saveMsg(self._uid)
 
-
 	def delete(self):
 
 		self._mb.deleteMsg(self._uid)
 
 
-
-
 class IvrDialog(IvrDialogBase):
 
 	def __init__(self):
@@ -59,12 +54,11 @@ class IvrDialog(IvrDialogBase):
 
 		self.cur_msg = 0
 		self.exit    = False
-		
-		self.key_enabled = False
 
+		self.key_enabled = False
 
 	def loadVoiceLib(self):
-		
+
 		self.voice_lib = dict()
 
 		# Parts for the welcome text
@@ -95,23 +89,21 @@ class IvrDialog(IvrDialogBase):
 		# Menu will be looped until a key is pressed
 		self.voice_lib['msg_menu'].loop = True
 
-
 	def loadMsgList(self,criterion):
 
 		msg_list = List()
 		name_list = self.mailbox.getWavMsgList(criterion)
 		for n in name_list:
 			msg_list.append(VoiceMsg(n,self.mailbox))
-			
-		return msg_list
 
+		return msg_list
 
 	def onSessionStart(self):
 
 		self.__init__()
 		self.loadVoiceLib()
 
-		self.mailbox = IMAP4_Mailbox(getAppParam("Mailbox-URL"));
+		self.mailbox = IMAP4_Mailbox(getAppParam("Mailbox-URL"))
 		debug("***** Mailbox Url: ******\n" + str(self.mailbox.url))
 
 		self.new_msgs = self.loadMsgList('UNSEEN')
@@ -119,20 +111,20 @@ class IvrDialog(IvrDialogBase):
 
 		if (len(self.new_msgs) == 0) and \
 		       (len(self.saved_msgs) == 0):
-			
+
 			self.enqueue(self.voice_lib['no_msg'],None)
 			self.enqueue(self.voice_lib['bye'],None)
 			self.exit = True
 			return
-		
+
 		self.enqueue(self.voice_lib['you_have'],None)
 
 		if len(self.new_msgs) > 0:
-			
+
 			self.enqueue(self.voice_lib['new_msg'],None)
 			self.msg_list = weakref.proxy(self.new_msgs)
 			self.cur_list = weakref.ref(self.new_msgs)
-			
+
 			if len(self.saved_msgs) > 0:
 				self.enqueue(self.voice_lib['and'],None)
 				self.enqueue(self.voice_lib['saved_msg'],None)
@@ -142,13 +134,11 @@ class IvrDialog(IvrDialogBase):
 			self.cur_list = weakref.ref(self.saved_msgs)
 
 		self.enqueueCurMsg()
-		
 
 	def onBye(self):
-		
+
 		self.stopSession()
 
-	
 	def onEmptyQueue(self):
 
 		if self.exit:
@@ -156,7 +146,6 @@ class IvrDialog(IvrDialogBase):
 				self.bye()
 				self.stopSession()
 
-
 	def onDtmf(self,key,duration):
 
 		if not self.key_enabled:
@@ -166,7 +155,6 @@ class IvrDialog(IvrDialogBase):
 
 		if key == 1:
 			self.flush()
-			
 
 		elif key == 2:
 			self.key_enabled = False
@@ -174,7 +162,7 @@ class IvrDialog(IvrDialogBase):
 			self.msg_list[self.cur_msg].save()
 			self.enqueue(self.voice_lib['msg_saved'],None)
 			self.cur_msg += 1
-			
+
 		elif key == 3:
 			self.key_enabled = False
 			self.flush()
@@ -183,27 +171,26 @@ class IvrDialog(IvrDialogBase):
 			self.cur_msg += 1
 		else:
 			return
-			
+
 		if not self.enqueueCurMsg():
 
 			debug("self.cur_list() is self.new_msgs = %s" % repr(self.cur_list() is self.new_msgs))
 			debug("len(self.saved_msgs) = %i" % len(self.saved_msgs))
-			
+
 			if (self.cur_list() is self.new_msgs) and \
 			   len(self.saved_msgs) > 0:
-				
+
 				self.cur_msg = 0
-				
+
 				self.msg_list = weakref.proxy(self.saved_msgs)
 				self.cur_list = weakref.ref(self.saved_msgs)
-				
+
 				self.enqueue(self.voice_lib['saved_msg'],None)
 				self.enqueueCurMsg()
 			else:
 				self.enqueue(self.voice_lib['bye'],None)
 				self.exit = True
 
-
 	def enqueueCurMsg(self):
 
 		if self.cur_msg >= len(self.msg_list):
@@ -213,10 +200,10 @@ class IvrDialog(IvrDialogBase):
 			self.enqueue(self.voice_lib['next_msg'],None)
 		else:
 			self.enqueue(self.voice_lib['first_msg'],None)
-			
+
 		self.enqueue(self.msg_list[self.cur_msg].audio(),None)
 		self.enqueue(self.voice_lib['msg_menu'],None)
-		
+
 		self.key_enabled = True
 
 		return True
diff --git a/apps/mobile_push/load_test/call_gen.py b/apps/mobile_push/load_test/call_gen.py
index 724f558b..3d0eb83f 100755
--- a/apps/mobile_push/load_test/call_gen.py
+++ b/apps/mobile_push/load_test/call_gen.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
-from xmlrpclib import * 
+
+from xmlrpclib import *
+
 s = ServerProxy('http://127.0.0.1:8092')
 print(s.setTarget(100, 1, 0, '4', '192.168.5.110', 2, 0, 30, 40))
-
diff --git a/apps/mobile_push/load_test/example_server.py b/apps/mobile_push/load_test/example_server.py
index 8187bd83..f7a68cab 100644
--- a/apps/mobile_push/load_test/example_server.py
+++ b/apps/mobile_push/load_test/example_server.py
@@ -11,6 +11,7 @@ class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler):
         s.send_response(200)
         s.send_header("Content-type", "text/html")
         s.end_headers()
+
     def do_GET(s):
         """Respond to a GET request."""
         s.send_response(200)
@@ -23,6 +24,7 @@ class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler):
         s.wfile.write("<p>You accessed path: %s</p>" % s.path)
         s.wfile.write("</body></html>")
 
+
 if __name__ == '__main__':
     server_class = BaseHTTPServer.HTTPServer
     httpd = server_class((HOST_NAME, PORT_NUMBER), MyHandler)
@@ -33,4 +35,3 @@ if __name__ == '__main__':
         pass
     httpd.server_close()
     print(time.asctime(), "Server Stops - %s:%s" % (HOST_NAME, PORT_NUMBER))
-
diff --git a/apps/mobile_push/load_test/reg_client.py b/apps/mobile_push/load_test/reg_client.py
index 3bce8400..28029e63 100755
--- a/apps/mobile_push/load_test/reg_client.py
+++ b/apps/mobile_push/load_test/reg_client.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from xmlrpclib import * 
+from xmlrpclib import *
 from random import *
 import time
 
@@ -16,5 +16,5 @@ while True:
   else:
     print(s.createRegistration(n, str(n), str(n), '192.168.5.110'))
     r.add(n)
-    
-  time.sleep(.1)
\ No newline at end of file
+
+  time.sleep(.1)
diff --git a/apps/pin_collect/pin_collect.py b/apps/pin_collect/pin_collect.py
index 7afff5af..ec0a39a9 100644
--- a/apps/pin_collect/pin_collect.py
+++ b/apps/pin_collect/pin_collect.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+
 from log import *
 from ivr import *
 
@@ -13,6 +14,7 @@ connect_failed  = 2
 HINT_TIMER   = 1
 HINT_TIMEOUT = 10 # seconds until hint msg is played
 
+
 class IvrDialog(IvrDialogBase):
     # messages to be played to the caller
 	welcome_msg   = None
@@ -28,9 +30,8 @@ class IvrDialog(IvrDialogBase):
 	# cseq of transfer request
 	transfer_cseq    = None
 	# remote_uri of dialog
-	dlg_remote_uri   = None	
+	dlg_remote_uri   = None
 
-		
 	def sessionInfo(self):
 		debug("IVR Session info:")
 		debug(" user:        " + self.dialog.user)
@@ -52,10 +53,10 @@ class IvrDialog(IvrDialogBase):
 	def onSessionStart(self):
 		self.sessionInfo()
 		self.setNoRelayonly()
-		
+
 		self.welcome_msg = IvrAudioFile()
 		self.welcome_msg.open(config['welcome_msg'],AUDIO_READ)
-		
+
 		self.pin_msg = IvrAudioFile()
 		self.pin_msg.open(config['pin_msg'],AUDIO_READ)
 
@@ -78,7 +79,7 @@ class IvrDialog(IvrDialogBase):
 					try:
 						c = xmlrpclib.ServerProxy(config['auth_xmlrpc_url'])
 						erg = c.authorize(self.dialog.user, self.keys)
-	
+
 						debug('result of authentication: '+ str(erg))
 						if erg == 'OK':
 							self.state = connect
@@ -86,27 +87,27 @@ class IvrDialog(IvrDialogBase):
 							self.dlg_remote_uri	= self.dialog.remote_uri
 							debug("saved remote_uri "+ self.dlg_remote_uri)
 							self.transfer_cseq = self.dialog.cseq
-							self.redirect("sip:" + self.dialog.user + "@" + \
+							self.redirect("sip:" + self.dialog.user + "@" +
 								      self.dialog.domain)
 						else:
 							self.flush()
 							self.keys = ''
-							if self.auth_fail_msg == None:
+							if self.auth_fail_msg is None:
 								self.auth_fail_msg = IvrAudioFile()
 								self.auth_fail_msg.open(config['auth_fail_msg'],AUDIO_READ)
 							self.enqueue(self.auth_fail_msg,None)
-					except:
+					except Exception:
 						self.dlg_remote_uri = self.dialog.remote_uri
-						self.state = connect_failed		
+						self.state = connect_failed
 						self.fail_msg = IvrAudioFile()
 						self.fail_msg.open(config['fail_msg'],AUDIO_READ)
 						self.enqueue(self.fail_msg,None)
-						
+
 				elif config['auth_mode'] == 'REFER':
 					self.state = connect
 					self.removeTimer(HINT_TIMER)
 					self.transfer_cseq = self.dialog.cseq
-					self.refer("sip:" + self.dialog.user + "+" + self.keys + "@" + \
+					self.refer("sip:" + self.dialog.user + "+" + self.keys + "@" +
 						self.dialog.domain, 20)
 				else:
 					self.state = connect
@@ -114,11 +115,9 @@ class IvrDialog(IvrDialogBase):
 					self.dlg_remote_uri     = self.dialog.remote_uri
 					debug("saved remote_uri "+ self.dlg_remote_uri)
 					self.transfer_cseq = self.dialog.cseq
-					self.redirect("sip:" + self.dialog.user + "+" + self.keys + "@" + \
+					self.redirect("sip:" + self.dialog.user + "+" + self.keys + "@" +
 						self.dialog.domain)
 
-
-
 	def onEmptyQueue(self):
 		if self.state == collect:
 			self.setTimer(HINT_TIMER, HINT_TIMEOUT)
@@ -141,7 +140,7 @@ class IvrDialog(IvrDialogBase):
 				self.dropSession()
 			elif reply.code >= 300:
 				debug("transfer failed. notifying user")
-				self.state = connect_failed		
+				self.state = connect_failed
 				self.fail_msg = IvrAudioFile()
 				self.fail_msg.open(config['fail_msg'],AUDIO_READ)
 				self.enqueue(self.fail_msg,None)
diff --git a/apps/pin_collect/test/authserver.py b/apps/pin_collect/test/authserver.py
index 66b9c4b5..323fc736 100644
--- a/apps/pin_collect/test/authserver.py
+++ b/apps/pin_collect/test/authserver.py
@@ -1,5 +1,6 @@
 import SimpleXMLRPCServer
 
+
 #The server object
 class AuthServer:
 	def __init__(self):
@@ -15,6 +16,7 @@ class AuthServer:
 			self.keys[room] = pin
 			return 'OK'
 
+
 authsrv = AuthServer()
 server = SimpleXMLRPCServer.SimpleXMLRPCServer(("127.0.0.1", 9090))
 server.register_instance(authsrv)
diff --git a/apps/py_sems/py/py_sems_log.py b/apps/py_sems/py/py_sems_log.py
index c0b18146..de90bda0 100644
--- a/apps/py_sems/py/py_sems_log.py
+++ b/apps/py_sems/py/py_sems_log.py
@@ -7,33 +7,39 @@ L_WARN = 1
 L_INFO = 2
 L_DBG  = 3
 
+
 def log(level, msg, args):
 
-	if args != None:
+	if args is not None:
 		tmp_msg = msg % args
 	else:
 		tmp_msg = msg
-		
+
 	py_sems.log(level,"PySems: " + tmp_msg + "\n")
 
 
 def error(msg, args=None):
 	log(L_ERR, msg, args)
 
+
 def warn(msg, args=None):
 	log(L_WARN, msg, args)
 
+
 def info(msg, args=None):
 	log(L_INFO, msg, args)
-	
+
+
 def debug(msg, args=None):
 	log(L_DBG, msg, args)
 
 
 def stacktrace(tb):
 
-	if tb: last_file = stacktrace(tb.tb_next)
-	else: return
+	if tb:
+		last_file = stacktrace(tb.tb_next)
+	else:
+		return
 
 	f = tb.tb_frame.f_code.co_filename
 	line = tb.tb_frame.f_lineno
@@ -53,7 +59,6 @@ def log_excepthook(exception, value, tb):
 	error('********** end of PySems exception report *********')
 
 
-
 # init code
 sys.excepthook = log_excepthook
 debug("PySems logging started")
diff --git a/apps/sbc/call_control/prepaid_xmlrpc/server/xmlrpcserver.py b/apps/sbc/call_control/prepaid_xmlrpc/server/xmlrpcserver.py
index 365633fe..0617e627 100644
--- a/apps/sbc/call_control/prepaid_xmlrpc/server/xmlrpcserver.py
+++ b/apps/sbc/call_control/prepaid_xmlrpc/server/xmlrpcserver.py
@@ -6,6 +6,7 @@ import string
 server = SimpleXMLRPCServer(("localhost", 8000))
 server.register_introspection_functions()
 
+
 class MyFuncs:
 	def getCredit(self, arg):
 		print("Function getCredit")
@@ -28,5 +29,6 @@ class MyFuncs:
 		print("                credit: ", credit)
 		return credit
 
+
 server.register_instance(MyFuncs())
 server.serve_forever()
diff --git a/apps/twit/twit.py b/apps/twit/twit.py
index 057145ba..d2e2ad7b 100644
--- a/apps/twit/twit.py
+++ b/apps/twit/twit.py
@@ -14,6 +14,7 @@ twit_account_msg = config['twit_account_msg']
 twit_ok_msg = config['twit_ok_msg']
 twit_posting_msg = config['twit_posting_msg']
 
+
 class IvrDialog(IvrDialogBase) :
 
 	def onSessionStart( self ) :
@@ -27,46 +28,46 @@ class IvrDialog(IvrDialogBase) :
 				self.t_pwd = parts[2]
 				if len(parts) == 4:
 					self.t_msg = unquote(parts[3])
-		
-		if not account_found:		
+
+		if not account_found:
 			self.t_account = getAppParam("u")
 			self.t_pwd = getAppParam("p")
 			if (len(getAppParam("m"))) and getAppParam("m") != '<null>':
 				self.t_msg = unquote(getAppParam("m"))
 			if (self.t_account != '<null>' and self.t_account != '') and \
 				self.t_pwd != '<null>' and self.t_pwd != '':
-				account_found = True	
-			
+				account_found = True
+
 		if not account_found:
 			self.state = 'bye'
 			self.welcome_msg = IvrAudioFile()
 			self.welcome_msg.open(twit_account_msg, AUDIO_READ)
 			self.enqueue(self.welcome_msg, None)
 			return
-		
+
 		self.state = 'recording'
 		self.welcome_msg = IvrAudioFile()
 		self.welcome_msg.open(welcome_msg, AUDIO_READ)
 		self.enqueue(self.welcome_msg, None)
-		
+
 		self.audio_msg = IvrAudioFile()
 		self.twit_file = 'twit_' + ''.join(random.sample('abcdefghijklm', 8)) + '.wav'
 		self.audio_msg.open(rec_path + self.twit_file, AUDIO_WRITE)
 		self.enqueue(None,self.audio_msg)
 
 		self.setTimer(1, 180)
-		
+
 	def onTimer(self, id):
 		onDtmf(self, 0, 0)
 		pass
-	
+
 	def onDtmf(self, key_no, key_length):
 		self.flush()
 		self.state = 'recorded'
-		
+
 	def onBye(self):
 		self.stopSession()
-	
+
 	def onEmptyQueue(self):
 		log(1, 'eq in '+self.state)
 		if self.state == 'bye':
@@ -77,7 +78,7 @@ class IvrDialog(IvrDialogBase) :
 			self.posting_msg = IvrAudioFile()
 			self.posting_msg.open(twit_posting_msg, AUDIO_READ)
 			self.enqueue(self.posting_msg, None)
-			
+
 			longurl=base_url + self.twit_file
 			short_url_handle = urlopen('http://is.gd/api.php?longurl=%s' % longurl)
 			msg = twit_ok_msg
@@ -85,10 +86,8 @@ class IvrDialog(IvrDialogBase) :
 				t = twitter.Twitter()
 				t.set_auth(self.t_account, self.t_pwd)
 				return_val = t.status_update(self.t_msg+' @'+short_url_handle.read())
-			except:
+			except Exception:
 				msg = twit_err_msg
 			self.err_msg = IvrAudioFile()
 			self.err_msg.open(msg, AUDIO_READ)
 			self.enqueue(self.err_msg, None)
-
-
diff --git a/apps/webconference/pyqtgui/account.py b/apps/webconference/pyqtgui/account.py
index 87d823e1..4a05a7fe 100644
--- a/apps/webconference/pyqtgui/account.py
+++ b/apps/webconference/pyqtgui/account.py
@@ -9,6 +9,7 @@
 
 from PyQt4 import QtCore, QtGui
 
+
 class Ui_account(object):
     def setupUi(self, account):
         account.setObjectName("account")
@@ -56,4 +57,3 @@ class Ui_account(object):
         self.e_domain.setText(QtGui.QApplication.translate("account", "iptel.org", None, QtGui.QApplication.UnicodeUTF8))
         self.label_3.setText(QtGui.QApplication.translate("account", "Password", None, QtGui.QApplication.UnicodeUTF8))
         self.e_pwd.setText(QtGui.QApplication.translate("account", "password", None, QtGui.QApplication.UnicodeUTF8))
-
diff --git a/apps/webconference/pyqtgui/callbox.py b/apps/webconference/pyqtgui/callbox.py
index 0a7f558f..777260e1 100644
--- a/apps/webconference/pyqtgui/callbox.py
+++ b/apps/webconference/pyqtgui/callbox.py
@@ -9,6 +9,7 @@
 
 from PyQt4 import QtCore, QtGui
 
+
 class Ui_callbox(object):
     def setupUi(self, callbox):
         callbox.setObjectName("callbox")
@@ -37,4 +38,3 @@ class Ui_callbox(object):
         callbox.setWindowTitle(QtGui.QApplication.translate("callbox", "call", None, QtGui.QApplication.UnicodeUTF8))
         self.label.setText(QtGui.QApplication.translate("callbox", "calll", None, QtGui.QApplication.UnicodeUTF8))
         self.num.setText(QtGui.QApplication.translate("callbox", "+49", None, QtGui.QApplication.UnicodeUTF8))
-
diff --git a/apps/webconference/pyqtgui/conftable.py b/apps/webconference/pyqtgui/conftable.py
index c6f2f247..107a4716 100644
--- a/apps/webconference/pyqtgui/conftable.py
+++ b/apps/webconference/pyqtgui/conftable.py
@@ -9,6 +9,7 @@
 
 from PyQt4 import QtCore, QtGui
 
+
 class Ui_MainWindow(object):
     def setupUi(self, MainWindow):
         MainWindow.setObjectName("MainWindow")
@@ -30,7 +31,7 @@ class Ui_MainWindow(object):
         self.gridLayout_2 = QtGui.QGridLayout(self.frame_main)
         self.gridLayout_2.setObjectName("gridLayout_2")
         self.label = QtGui.QLabel(self.frame_main)
-        self.label.setStyleSheet("""QLabel { 
+        self.label.setStyleSheet("""QLabel {
     background-color: rgb(170, 200, 255);
 }
 """)
@@ -67,4 +68,3 @@ class Ui_MainWindow(object):
 "webconference", None, QtGui.QApplication.UnicodeUTF8))
         self.menuSettings.setTitle(QtGui.QApplication.translate("MainWindow", "Menu", None, QtGui.QApplication.UnicodeUTF8))
         self.actionQuit.setText(QtGui.QApplication.translate("MainWindow", "Quit", None, QtGui.QApplication.UnicodeUTF8))
-
diff --git a/apps/webconference/pyqtgui/participant.py b/apps/webconference/pyqtgui/participant.py
index 5e594371..679fac0a 100644
--- a/apps/webconference/pyqtgui/participant.py
+++ b/apps/webconference/pyqtgui/participant.py
@@ -9,6 +9,7 @@
 
 from PyQt4 import QtCore, QtGui
 
+
 class Ui_participant(object):
     def setupUi(self, participant):
         participant.setObjectName("participant")
@@ -46,4 +47,3 @@ class Ui_participant(object):
         self.l_status.setText(QtGui.QApplication.translate("participant", "status", None, QtGui.QApplication.UnicodeUTF8))
         self.bt_ciao.setText(QtGui.QApplication.translate("participant", "ciao", None, QtGui.QApplication.UnicodeUTF8))
         self.cb_muted.setText(QtGui.QApplication.translate("participant", "muted", None, QtGui.QApplication.UnicodeUTF8))
-
diff --git a/apps/webconference/pyqtgui/webconference.py b/apps/webconference/pyqtgui/webconference.py
index a7aaea9c..939b07f0 100755
--- a/apps/webconference/pyqtgui/webconference.py
+++ b/apps/webconference/pyqtgui/webconference.py
@@ -9,6 +9,7 @@
 # (c) 2009 Stefan Sayer <sayer at iptel.org>
 # License: GPLv3
 #
+
 import sys
 import random
 from PyQt4 import QtCore, QtGui
@@ -18,7 +19,7 @@ from PyQt4.QtCore import *
 from xmlrpclib import *
 from threading import *
 
-from conftable import * 
+from conftable import *
 from participant import *
 from callbox import *
 from account import *
@@ -36,10 +37,11 @@ HAS_ACCOUNT=False
 try:
 	from accountconfig import *
 	HAS_ACCOUNT=True
-except:
+except Exception:
 	print("accountconfig.py not found - will ask for account to make calls")
 	pass
 
+
 class named_participant(Ui_participant):
 	def __init__(self, parent, title, callid, id):
 		self.callid = callid
@@ -48,12 +50,12 @@ class named_participant(Ui_participant):
 		self.parent = parent
 		self.tag = ""
 		parent.setWindowTitle(title)
-		QtCore.QObject.connect(self.bt_ciao, QtCore.SIGNAL("clicked()"), self.ciao_clicked)		
+		QtCore.QObject.connect(self.bt_ciao, QtCore.SIGNAL("clicked()"), self.ciao_clicked)
 		QtCore.QObject.connect(self.cb_muted, QtCore.SIGNAL("stateChanged(int)"), self.muted_changed)
-		
+
 	def ciao_clicked(self):
 		self.bt_ciao.emit(QtCore.SIGNAL("ciao(int)"), self.id)
-		
+
 	def status2text(self, s):
 		return { 0:    "Disconnected",
          		 1:    "Connecting",
@@ -61,7 +63,7 @@ class named_participant(Ui_participant):
          		 3:    "Connected",
          		 4:    "Disconnecting",
          		 5:    "Finished"}[s]
-		
+
 	def set_status(self, status, hint, muted):
 		self.l_status.setText(self.status2text(status))
 		self.l_status.setToolTip(hint)
@@ -69,26 +71,26 @@ class named_participant(Ui_participant):
 			self.cb_muted.setCheckState(Qt.Checked)
 		else:
 			self.cb_muted.setCheckState(Qt.Unchecked)
-	
+
 	def muted_changed(self, i):
 		print("callid is" , self.callid)
 		self.cb_muted.emit(QtCore.SIGNAL("mute(int,bool)"), self.id, self.cb_muted.isChecked())
-		
-		
+
+
 class StartQT4(QtGui.QMainWindow):
 	participants = []
 	roomname = ""
-	adminpin = ""	
+	adminpin = ""
 	s = None
 	last_res = None
-	
+
 	def __init__(self, parent=None):
 		QtGui.QWidget.__init__(self, parent)
 		self.ui = Ui_MainWindow()
 		self.ui.setupUi(self)
 		self.show()
 
-		if HAS_ACCOUNT:		
+		if HAS_ACCOUNT:
 			self.call_domain = DOMAIN
 			self.call_user = USER
 			self.call_pwd = PASSWORD
@@ -99,12 +101,12 @@ class StartQT4(QtGui.QMainWindow):
 			dlg_cb.setupUi(dlg)
 			if dlg.exec_() == QDialog.Rejected:
 				raise "well, I need a SIP account to make calls"
-		
+
 			self.call_domain = str(dlg_cb.e_domain.text())
 			self.call_pwd = str(dlg_cb.e_pwd.text())
 			self.call_user = str(dlg_cb.e_user.text())
 			self.call_auth_user = self.call_user
-		
+
 		QtCore.QObject.connect(self.ui.buttonNew, QtCore.SIGNAL("clicked()"), self.new_call)
 		self.s = ServerProxy(CONTROL_URI)
 		print("server has %d running calls " % self.s.calls())
@@ -119,28 +121,28 @@ class StartQT4(QtGui.QMainWindow):
 				break
 		if self.adminpin == "":
 			raise "oh, could not get a free room :("
-		
+
 		print("roomname is %s, adminpin is %s "% (self.roomname, self.adminpin))
-		self.ui.label.setText("iptel.org\nwebconference\nhttps://webconference.iptel.org\n\nroom: %s    adminpin:%s\n\n" 
+		self.ui.label.setText("iptel.org\nwebconference\nhttps://webconference.iptel.org\n\nroom: %s    adminpin:%s\n\n"
 		                      "to dial in call sip:conference@iptel.org \nand type %s*"
 		   %(self.roomname, self.adminpin, self.roomname))
 
 		self.timer = QtCore.QTimer(self)
 		self.connect(self.timer, QtCore.SIGNAL("timeout()"), self.timer_hit)
 		self.timer.start(REFRESH_INTERVAL)
-		
+
 	def timer_hit(self):
 		res = self.s.di('webconference', 'roomInfo', self.roomname, self.adminpin)
 		if res[0] != 0:
 			print("oh my god, can't see this room!")
 			return
-		
+
 		code, reason, participants, serverstatus = res
 		if participants == self.last_res:
 			return #optimize a bit
-		
+
 		self.last_res = participants
-		
+
 		for part in participants:
 			call_tag, number, status, reason, muted, participant_id = part
 			found = False
@@ -152,7 +154,7 @@ class StartQT4(QtGui.QMainWindow):
 			if not found:
 				p = self.createparticipantWidget(number, call_tag)
 				p.set_status(status, reason, muted)
-				
+
 	def createparticipantWidget(self, name, callid):
 		w = QtGui.QDockWidget("someone", self.ui.frame_main)
 		part = named_participant(w, name, callid, len(self.participants))
@@ -163,7 +165,7 @@ class StartQT4(QtGui.QMainWindow):
 		w.show()
 		self.participants = self.participants + [ part ]
 		return part
-		
+
 	def new_call(self):
 		print("a new call.")
 		dlg = QtGui.QDialog(self)
@@ -171,31 +173,29 @@ class StartQT4(QtGui.QMainWindow):
 		dlg_cb.setupUi(dlg)
 		if dlg.exec_() == QDialog.Rejected:
 			return
-		
+
 		print("now calling %s " % dlg_cb.num.text())
 		res = self.s.di('webconference', 'dialout', self.roomname, self.adminpin, str(dlg_cb.num.text()),
 				self.call_user, self.call_domain, self.call_auth_user, self.call_pwd)
 		if res[0] != 0:
 			print("oh, my dear, calling failed with code %d " % res[0])
 			return
-		code, result, callid, serverinfo = res	
+		code, result, callid, serverinfo = res
 		print("code %d result %s " % (code, result))
 		print("serverinfo is %s " % serverinfo)
-						
+
 		self.createparticipantWidget(dlg_cb.num.text(), callid)
-		
+
 	def part_ciao(self, id):
 		print("ciao: ", id)
 		self.s.di('webconference', 'kickout', self.roomname, self.adminpin, self.participants[id].callid)
-		
+
 	def part_muted(self, id, s):
 		print("mute: ", id, " is ", s)
 		if s:
 			self.s.di('webconference', 'mute', self.roomname, self.adminpin, self.participants[id].callid)
 		else:
 			self.s.di('webconference', 'unmute', self.roomname, self.adminpin, self.participants[id].callid)
-		
-		
 
 
 if __name__ == "__main__":
@@ -203,4 +203,3 @@ if __name__ == "__main__":
 	myapp = StartQT4()
 	myapp.show()
 	sys.exit(app.exec_())
-
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..5c149670
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,7 @@
+[tool.black]
+# Match line-length expected by pycodestyle.
+line-length = 200
+# Current version in Debian trixie.
+target-version = ['py313']
+# Enable preview features, expected by pycodestyle.
+preview = true
diff --git a/t/sems_tester.py b/t/sems_tester.py
index 08d34e50..bf4d5525 100644
--- a/t/sems_tester.py
+++ b/t/sems_tester.py
@@ -100,12 +100,12 @@ class TestCase(unittest.TestCase):
         s = sock
         if not s:
             s = self.makeXMLRPCSocket()
-        l = len(req)
+        req_len = len(req)
         req = (
             b"POST / HTTP/1.1\r\nConnection: close\r\nHost: 127.0.0.1:"
             + bytes(self._xmlrpc_port)
             + b"\r\nUser-Agent: Tester\r\nContent-Type: text/xml\r\nContent-Length: "
-            + bytes(str(l), "latin1")
+            + bytes(str(req_len), "latin1")
             + b"\r\n\r\n"
             + req
         )
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 00000000..d7e05cc7
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,4 @@
+[pycodestyle]
+max-line-length = 200
+# Ignore valid reports for now.
+ignore = E101,E111,E117,E126,E127,E128,E201,E202,E203,E221,E222,E223,E225,E226,E227,E231,E241,E261,E262,E265,W191,W503,W504