linted for trailing whitespaces

14 files changed, 109 insertions, 97 deletions

diff --git a/pysnmp/carrier/asyncio/base.py b/pysnmp/carrier/asyncio/base.py
index 200889b1..08902ed8 100644
--- a/pysnmp/carrier/asyncio/base.py
+++ b/pysnmp/carrier/asyncio/base.py
@@ -3,26 +3,26 @@
 # Authors: Matt Hooks <me@matthooks.com>
 #          Zachary Lorusso <zlorusso@gmail.com>
 #
-# Redistribution and use in source and binary forms, with or without 
+# Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 # * Redistributions of source code must retain the above copyright notice,
 #   this list of conditions and the following disclaimer.
 #
 # * Redistributions in binary form must reproduce the above copyright
-#   notice, this list of conditions and the following disclaimer in the 
+#   notice, this list of conditions and the following disclaimer in the
 #   documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
-# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
-# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
-# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 # THE POSSIBILITY OF SUCH DAMAGE.
 #
 from pysnmp.carrier.asyncio.dispatch import AsyncioDispatcher
diff --git a/pysnmp/carrier/asyncio/dgram/base.py b/pysnmp/carrier/asyncio/dgram/base.py
index a37aa262..2052b442 100644
--- a/pysnmp/carrier/asyncio/dgram/base.py
+++ b/pysnmp/carrier/asyncio/dgram/base.py
@@ -3,26 +3,26 @@
 # Authors: Matt Hooks <me@matthooks.com>
 #          Zachary Lorusso <zlorusso@gmail.com>
 #
-# Redistribution and use in source and binary forms, with or without 
+# Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 # * Redistributions of source code must retain the above copyright notice,
 #   this list of conditions and the following disclaimer.
 #
 # * Redistributions in binary form must reproduce the above copyright
-#   notice, this list of conditions and the following disclaimer in the 
+#   notice, this list of conditions and the following disclaimer in the
 #   documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
-# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
-# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
-# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 # THE POSSIBILITY OF SUCH DAMAGE.
 #
 import sys
diff --git a/pysnmp/carrier/asyncio/dgram/udp.py b/pysnmp/carrier/asyncio/dgram/udp.py
index 653c83c4..0470d1b2 100644
--- a/pysnmp/carrier/asyncio/dgram/udp.py
+++ b/pysnmp/carrier/asyncio/dgram/udp.py
@@ -3,32 +3,31 @@
 # Authors: Matt Hooks <me@matthooks.com>
 #          Zachary Lorusso <zlorusso@gmail.com>
 #
-# Redistribution and use in source and binary forms, with or without 
+# Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 # * Redistributions of source code must retain the above copyright notice,
 #   this list of conditions and the following disclaimer.
 #
 # * Redistributions in binary form must reproduce the above copyright
-#   notice, this list of conditions and the following disclaimer in the 
+#   notice, this list of conditions and the following disclaimer in the
 #   documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
-# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
-# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
-# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 # THE POSSIBILITY OF SUCH DAMAGE.
 #
 import socket
 from pysnmp.carrier.base import AbstractTransportAddress
 from pysnmp.carrier.asyncio.dgram.base import DgramAsyncioProtocol
-from pysnmp.carrier import error
 try:
     import asyncio
 except ImportError:
diff --git a/pysnmp/carrier/asyncio/dgram/udp6.py b/pysnmp/carrier/asyncio/dgram/udp6.py
index 8d791741..63800112 100644
--- a/pysnmp/carrier/asyncio/dgram/udp6.py
+++ b/pysnmp/carrier/asyncio/dgram/udp6.py
@@ -1,7 +1,6 @@
 import socket
 from pysnmp.carrier.base import AbstractTransportAddress
 from pysnmp.carrier.asyncio.dgram.base import DgramAsyncioProtocol
-from pysnmp.carrier import error
 try:
     import asyncio
 except ImportError:
diff --git a/pysnmp/carrier/asyncio/dispatch.py b/pysnmp/carrier/asyncio/dispatch.py
index 3886a44a..ca96683e 100644
--- a/pysnmp/carrier/asyncio/dispatch.py
+++ b/pysnmp/carrier/asyncio/dispatch.py
@@ -3,26 +3,26 @@
 # Authors: Matt Hooks <me@matthooks.com>
 #          Zachary Lorusso <zlorusso@gmail.com>
 #
-# Redistribution and use in source and binary forms, with or without 
+# Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 # * Redistributions of source code must retain the above copyright notice,
 #   this list of conditions and the following disclaimer.
 #
 # * Redistributions in binary form must reproduce the above copyright
-#   notice, this list of conditions and the following disclaimer in the 
+#   notice, this list of conditions and the following disclaimer in the
 #   documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
-# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
-# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
-# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
+# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 # THE POSSIBILITY OF SUCH DAMAGE.
 #
 import sys
diff --git a/pysnmp/carrier/asyncore/base.py b/pysnmp/carrier/asyncore/base.py
index bee6ca6b..006ca6ea 100644
--- a/pysnmp/carrier/asyncore/base.py
+++ b/pysnmp/carrier/asyncore/base.py
@@ -9,7 +9,8 @@ from pysnmp import debug
 class AbstractSocketTransport(asyncore.dispatcher, AbstractTransport):
     protoTransportDispatcher = AsyncoreDispatcher
     sockFamily = sockType = None
-    retryCount = 0; retryInterval = 0
+    retryCount = 0
+    retryInterval = 0
     bufferSize = 131070
     def __init__(self, sock=None, sockMap=None):
         asyncore.dispatcher.__init__(self)
@@ -45,7 +46,8 @@ class AbstractSocketTransport(asyncore.dispatcher, AbstractTransport):
         sock.setblocking(0)
         self.set_socket(sock)
 
-    def __hash__(self): return hash(self.socket)
+    def __hash__(self):
+        return hash(self.socket)
 
     # The following two methods are part of base class so here we overwrite
     # them to separate socket management from dispatcher registration tasks.
@@ -62,17 +64,17 @@ class AbstractSocketTransport(asyncore.dispatcher, AbstractTransport):
 
     def registerSocket(self, sockMap=None):
         self.add_channel(sockMap)
-        
+
     def unregisterSocket(self, sockMap=None):
         self.del_channel(sockMap)
-        
+
     def closeTransport(self):
         AbstractTransport.closeTransport(self)
         self.close()
-        
+
     # asyncore API
-    def handle_close(self): raise error.CarrierError(
-        'Transport unexpectedly closed'
-        )
-    def handle_error(self): raise
+    def handle_close(self):
+        raise error.CarrierError('Transport unexpectedly closed')
 
+    def handle_error(self):
+        raise
diff --git a/pysnmp/carrier/asyncore/dgram/base.py b/pysnmp/carrier/asyncore/dgram/base.py
index 37d7b5b2..0e139276 100644
--- a/pysnmp/carrier/asyncore/dgram/base.py
+++ b/pysnmp/carrier/asyncore/dgram/base.py
@@ -23,12 +23,12 @@ class DgramSocketTransport(AbstractSocketTransport):
     def __init__(self, sock=None, sockMap=None):
         self.__outQueue = []
         self._sendto = lambda s,b,a: s.sendto(b, a)
-        def __recvfrom(s, sz): 
+        def __recvfrom(s, sz):
             d, a = s.recvfrom(sz)
             return d, self.addressType(a)
         self._recvfrom = __recvfrom
         AbstractSocketTransport.__init__(self, sock, sockMap)
-        
+
     def openClientMode(self, iface=None):
         if iface is not None:
             try:
@@ -129,7 +129,7 @@ class DgramSocketTransport(AbstractSocketTransport):
                 debug.logger & debug.flagIO and debug.logger('handle_write: ignoring socket error %s' % (sys.exc_info()[1],))
             else:
                 raise error.CarrierError('sendto() failed for %s: %s' % (transportAddress, sys.exc_info()[1]))
-            
+
     def readable(self): return 1
     def handle_read(self):
         try:
diff --git a/pysnmp/carrier/asyncore/dgram/udp6.py b/pysnmp/carrier/asyncore/dgram/udp6.py
index 73d0d663..28ba1540 100644
--- a/pysnmp/carrier/asyncore/dgram/udp6.py
+++ b/pysnmp/carrier/asyncore/dgram/udp6.py
@@ -6,7 +6,8 @@ import socket
 
 domainName = snmpUDP6Domain = (1, 3, 6, 1, 2, 1, 100, 1, 2)
 
-class Udp6TransportAddress(tuple, AbstractTransportAddress): pass
+class Udp6TransportAddress(tuple, AbstractTransportAddress):
+    pass
 
 class Udp6SocketTransport(DgramSocketTransport):
     sockFamily = socket.has_ipv6 and socket.AF_INET6 or None
@@ -14,12 +15,10 @@ class Udp6SocketTransport(DgramSocketTransport):
 
     def normalizeAddress(self, transportAddress):
         if '%' in transportAddress[0]:  # strip zone ID
-            ta = self.addressType(
-                     (transportAddress[0].split('%')[0],
-                      transportAddress[1],
-                      0, # flowinfo
-                      0) # scopeid
-                 )
+            ta = self.addressType((transportAddress[0].split('%')[0],
+                                   transportAddress[1],
+                                   0,   # flowinfo
+                                   0))  # scopeid
         else:
             ta = self.addressType(
                      (transportAddress[0], transportAddress[1], 0, 0)
@@ -30,5 +29,5 @@ class Udp6SocketTransport(DgramSocketTransport):
             return ta.setLocalAddress(transportAddress.getLocalAddress())
         else:
             return ta.setLocalAddress(self.getLocalAddress())
- 
+
 Udp6Transport = Udp6SocketTransport
diff --git a/pysnmp/carrier/asyncore/dispatch.py b/pysnmp/carrier/asyncore/dispatch.py
index 790152d0..2124bfd8 100644
--- a/pysnmp/carrier/asyncore/dispatch.py
+++ b/pysnmp/carrier/asyncore/dispatch.py
@@ -13,9 +13,12 @@ class AsyncoreDispatcher(AbstractTransportDispatcher):
         self.timeout = 0.5
         AbstractTransportDispatcher.__init__(self)
 
-    def getSocketMap(self): return self.__sockMap
-    def setSocketMap(self, sockMap=socket_map): self.__sockMap = sockMap
-    
+    def getSocketMap(self):
+        return self.__sockMap
+
+    def setSocketMap(self, sockMap=socket_map):
+        self.__sockMap = sockMap
+
     def registerTransport(self, tDomain, t):
         AbstractTransportDispatcher.registerTransport(self, tDomain, t)
         t.registerSocket(self.__sockMap)
@@ -29,7 +32,7 @@ class AsyncoreDispatcher(AbstractTransportDispatcher):
             if transport.writable():
                 return 1
         return 0
-    
+
     def runDispatcher(self, timeout=0.0):
         while self.jobsArePending() or self.transportsAreWorking():
             try:
diff --git a/pysnmp/carrier/base.py b/pysnmp/carrier/base.py
index 5d6772a6..08273fb1 100644
--- a/pysnmp/carrier/base.py
+++ b/pysnmp/carrier/base.py
@@ -6,19 +6,30 @@ class TimerCallable:
         self.__cbFun = cbFun
         self.__callInterval = callInterval
         self.__nextCall = 0
-        
+
     def __call__(self, timeNow):
         if self.__nextCall <= timeNow:
             self.__cbFun(timeNow)
             self.__nextCall = timeNow + self.__callInterval
 
-    def __eq__(self, cbFun): return self.__cbFun == cbFun
-    def __ne__(self, cbFun): return self.__cbFun != cbFun
-    def __lt__(self, cbFun): return self.__cbFun < cbFun
-    def __le__(self, cbFun): return self.__cbFun <= cbFun
-    def __gt__(self, cbFun): return self.__cbFun > cbFun
-    def __ge__(self, cbFun): return self.__cbFun >= cbFun
-    
+    def __eq__(self, cbFun):
+        return self.__cbFun == cbFun
+
+    def __ne__(self, cbFun):
+        return self.__cbFun != cbFun
+
+    def __lt__(self, cbFun):
+        return self.__cbFun < cbFun
+
+    def __le__(self, cbFun):
+        return self.__cbFun <= cbFun
+
+    def __gt__(self, cbFun):
+        return self.__cbFun > cbFun
+
+    def __ge__(self, cbFun):
+        return self.__cbFun >= cbFun
+
 class AbstractTransportDispatcher:
     def __init__(self):
         self.__transports = {}
@@ -31,7 +42,7 @@ class AbstractTransportDispatcher:
         self.__timerDelta = self.__timerResolution * 0.05
         self.__nextTime = 0
         self.__routingCbFun = None
-        
+
     def _cbFun(self, incomingTransport, transportAddress, incomingMessage):
         if incomingTransport in self.__transportDomainMap:
             transportDomain = self.__transportDomainMap[incomingTransport]
@@ -115,10 +126,9 @@ class AbstractTransportDispatcher:
         raise error.CarrierError(
             'Transport %s not registered' % (transportDomain,)
             )
-        
-    def sendMessage(
-        self, outgoingMessage, transportDomain, transportAddress
-        ):
+
+    def sendMessage(self, outgoingMessage, transportDomain,
+                    transportAddress):
         if transportDomain in self.__transports:
             self.__transports[transportDomain].sendMessage(
                 outgoingMessage, transportAddress
@@ -130,21 +140,22 @@ class AbstractTransportDispatcher:
 
     def getTimerResolution(self):
         return self.__timerResolution
+
     def setTimerResolution(self, timerResolution):
         if timerResolution < 0.01 or timerResolution > 10:
             raise error.CarrierError('Impossible timer resolution')
         self.__timerResolution = timerResolution
         self.__timerDelta = timerResolution * 0.05
-    
+
     def getTimerTicks(self): return self.__ticks
-    
+
     def handleTimerTick(self, timeNow):
         if self.__nextTime == 0:   # initial initialization
             self.__nextTime = timeNow + self.__timerResolution - self.__timerDelta
 
         if self.__nextTime >= timeNow:
             return
-        
+
         self.__ticks += 1
         self.__nextTime = timeNow + self.__timerResolution - self.__timerDelta
 
@@ -170,7 +181,7 @@ class AbstractTransportDispatcher:
 
     def runDispatcher(self, timeout=0.0):
         raise error.CarrierError('Method not implemented')
-        
+
     def closeDispatcher(self):
         for tDomain in list(self.__transports):
             self.__transports[tDomain].closeTransport()
@@ -184,7 +195,7 @@ class AbstractTransportAddress:
     def setLocalAddress(self, s):
         self._localAddress = s
         return self
- 
+
     def getLocalAddress(self):
         return self._localAddress
 
@@ -213,12 +224,12 @@ class AbstractTransport:
         self.unregisterCbFun()
 
     # Public API
-    
+
     def openClientMode(self, iface=None):
         raise error.CarrierError('Method not implemented')
 
     def openServerMode(self, iface=None):
         raise error.CarrierError('Method not implemented')
-        
+
     def sendMessage(self, outgoingMessage, transportAddress):
         raise error.CarrierError('Method not implemented')
diff --git a/pysnmp/carrier/sockmsg.py b/pysnmp/carrier/sockmsg.py
index e83374f5..d84c6aa6 100644
--- a/pysnmp/carrier/sockmsg.py
+++ b/pysnmp/carrier/sockmsg.py
@@ -1,10 +1,10 @@
 #
 # The following routines act like sendto()/recvfrom() calls but additionally
-# support local address retrieval (what can be useful when listening on 
+# support local address retrieval (what can be useful when listening on
 # 0.0.0.0 or [::]) and source address spoofing (for transparent proxying).
 #
 # These routines are based on POSIX sendmsg()/recvmsg() calls which were made
-# available since Python 3.3. Therefore this module is only Python 3.x 
+# available since Python 3.3. Therefore this module is only Python 3.x
 # compatible.
 #
 # Parts of the code below is taken from:
@@ -21,34 +21,33 @@ else:
     import ctypes
     import ipaddress
     import socket
-    from pysnmp import debug
     from pysnmp.carrier import sockfix, error
 
     uint32_t = ctypes.c_uint32
     in_addr_t = uint32_t
- 
+
     class in_addr(ctypes.Structure):
         _fields_ = [('s_addr', in_addr_t)]
- 
+
     class in6_addr_U(ctypes.Union):
         _fields_ = [
             ('__u6_addr8', ctypes.c_uint8 * 16),
             ('__u6_addr16', ctypes.c_uint16 * 8),
             ('__u6_addr32', ctypes.c_uint32 * 4),
         ]
- 
+
     class in6_addr(ctypes.Structure):
         _fields_ = [
             ('__in6_u', in6_addr_U),
         ]
- 
+
     class in_pktinfo(ctypes.Structure):
         _fields_ = [
             ('ipi_ifindex', ctypes.c_int),
             ('ipi_spec_dst', in_addr),
             ('ipi_addr', in_addr),
         ]
- 
+
     class in6_pktinfo(ctypes.Structure):
         _fields_ = [
             ('ipi6_addr', in6_addr),
@@ -63,14 +62,14 @@ else:
                 if anc[0] == socket.SOL_IP and anc[1] == socket.IP_PKTINFO:
                     addr = in_pktinfo.from_buffer_copy(anc[2])
                     addr = ipaddress.IPv4Address(memoryview(addr.ipi_addr).tobytes())
-                    _to = (str(addr),s.getsockname()[1])
+                    _to = (str(addr), s.getsockname()[1])
                 elif anc[0] == socket.SOL_IPV6 and anc[1] == socket.IPV6_PKTINFO:
                     addr = in6_pktinfo.from_buffer_copy(anc[2])
                     addr = ipaddress.ip_address(memoryview(addr.ipi6_addr).tobytes())
-                    _to = (str(addr),s.getsockname()[1])
+                    _to = (str(addr), s.getsockname()[1])
             return data, addressType(_from).setLocalAddress(_to)
         return recvfrom
- 
+
     def getSendTo(addressType):
         def sendto(s, _data, _to):
             ancdata = []
diff --git a/pysnmp/carrier/twisted/dgram/base.py b/pysnmp/carrier/twisted/dgram/base.py
index 72dbd8e8..883311a6 100644
--- a/pysnmp/carrier/twisted/dgram/base.py
+++ b/pysnmp/carrier/twisted/dgram/base.py
@@ -10,7 +10,7 @@ class DgramTwistedTransport(DatagramProtocol, AbstractTwistedTransport):
     """Base Twisted datagram Transport, to be used with TwistedDispatcher"""
 
     # Twisted Datagram API
-    
+
     def datagramReceived(self, datagram, transportAddress):
         if self._cbFun is None:
             raise error.CarrierError('Unable to call cbFun')
diff --git a/pysnmp/carrier/twisted/dgram/udp.py b/pysnmp/carrier/twisted/dgram/udp.py
index 82e2d2b6..7bf9b9c6 100644
--- a/pysnmp/carrier/twisted/dgram/udp.py
+++ b/pysnmp/carrier/twisted/dgram/udp.py
@@ -13,7 +13,7 @@ class UdpTwistedTransport(DgramTwistedTransport):
     addressType = UdpTransportAddress
 
     # AbstractTwistedTransport API
-    
+
     def openClientMode(self, iface=None):
         if iface is None:
             iface = ('', 0)
diff --git a/pysnmp/carrier/twisted/dgram/unix.py b/pysnmp/carrier/twisted/dgram/unix.py
index dd590b0a..2e9f9db2 100644
--- a/pysnmp/carrier/twisted/dgram/unix.py
+++ b/pysnmp/carrier/twisted/dgram/unix.py
@@ -13,7 +13,7 @@ class UnixTwistedTransport(DgramTwistedTransport):
     addressType = UnixTransportAddress
 
     # AbstractTwistedTransport API
-    
+
     def openClientMode(self, iface=''):
         try:
             self._lport = reactor.connectUNIXDatagram(iface, self)
@@ -26,7 +26,7 @@ class UnixTwistedTransport(DgramTwistedTransport):
             self._lport = reactor.listenUNIXDatagram(iface, self)
         except Exception:
             raise error.CarrierError(sys.exc_info()[1])
-        
+
         return self
 
     def closeTransport(self):