diff --git a/instana/agent.py b/instana/agent.py
index 667cff05..f4d1571e 100644
--- a/instana/agent.py
+++ b/instana/agent.py
@@ -1,5 +1,5 @@
 import json
-import instana.log as l
+from instana import log
 import instana.fsm as f
 import instana.agent_const as a
 import threading
@@ -38,7 +38,7 @@ class Agent(object):
     from_ = None
 
     def __init__(self, sensor):
-        l.debug("initializing agent")
+        log.debug("initializing agent")
 
         self.sensor = sensor
         self.fsm = f.Fsm(self)
@@ -49,7 +49,7 @@ def to_json(self, o):
             return json.dumps(o, default=lambda o: o.__dict__,
                               sort_keys=False, separators=(',', ':')).encode()
         except Exception as e:
-            l.info("to_json: ", e, o)
+            log.info("to_json: ", e, o)
 
     def can_send(self):
         return self.fsm.fsm.current == "good2go"
@@ -87,8 +87,7 @@ def full_request_response(self, url, method, o, body, header):
                 self.reset()
             else:
                 if response.getcode() < 200 or response.getcode() >= 300:
-                    l.error("Request returned erroneous code",
-                            response.getcode())
+                    log.error("Request returned erroneous code", response.getcode())
                     if self.can_send():
                         self.reset()
                 else:
@@ -104,7 +103,8 @@ def full_request_response(self, url, method, o, body, header):
             # No need to show the initial 404s or timeouts.  The agent
             # should handle those correctly.
             if not (type(e) is urllib2.HTTPError and e.code == 404):
-                l.debug("%s: full_request_response: %s" % (threading.current_thread().name, str(e)))
+                log.debug("%s: full_request_response: %s" %
+                          (threading.current_thread().name, str(e)))
 
         return (b, h)
 
diff --git a/instana/django19.py b/instana/django19.py
index d7ed9ed8..be94c072 100644
--- a/instana/django19.py
+++ b/instana/django19.py
@@ -44,7 +44,6 @@ def process_response(self, request, response):
         return response
 
 
-
 def hook(module):
     """ Hook method to install the Instana middleware into Django """
     if "INSTANA_DEV" in os.environ:
@@ -52,7 +51,6 @@ def hook(module):
         print("Instana: Running django19 hook")
         print("==============================================================")
 
-
     if DJ19_INSTANA_MIDDLEWARE in module.settings.MIDDLEWARE_CLASSES:
         return
 
diff --git a/instana/fsm.py b/instana/fsm.py
index 561ecffd..85cd38ad 100644
--- a/instana/fsm.py
+++ b/instana/fsm.py
@@ -4,7 +4,7 @@
 import socket
 import threading as t
 import fysom as f
-import instana.log as l
+from instana import log
 import instana.agent_const as a
 
 
@@ -36,8 +36,8 @@ class Fsm(object):
     timer = None
 
     def __init__(self, agent):
-        l.info("Stan is on the scene.  Starting Instana instrumentation.")
-        l.debug("initializing fsm")
+        log.info("Stan is on the scene.  Starting Instana instrumentation.")
+        log.debug("initializing fsm")
 
         self.agent = agent
         self.fsm = f.Fysom({
@@ -53,8 +53,8 @@ def __init__(self, agent):
                 "onchangestate":  self.printstatechange}})
 
     def printstatechange(self, e):
-        l.debug('========= (%i#%s) FSM event: %s, src: %s, dst: %s ==========' % \
-                (os.getpid(), t.current_thread().name, e.event, e.src, e.dst))
+        log.debug('========= (%i#%s) FSM event: %s, src: %s, dst: %s ==========' %
+                  (os.getpid(), t.current_thread().name, e.event, e.src, e.dst))
 
     def reset(self):
         self.fsm.lookup()
@@ -79,26 +79,27 @@ def lookup_agent_host(self, e):
                     self.fsm.announce()
                     return True
 
-        l.warn("Instana Host Agent can't be found. Scheduling retry.")
+        log.warn("Instana Host Agent can't be found. Scheduling retry.")
         self.schedule_retry(self.lookup_agent_host, e, "agent_lookup")
         return False
 
     def get_default_gateway(self):
-        l.debug("checking default gateway")
+        log.debug("checking default gateway")
 
         try:
             proc = subprocess.Popen(
-                "/sbin/ip route | awk '/default/' | cut -d ' ' -f 3 | tr -d '\n'", shell=True, stdout=subprocess.PIPE)
+                "/sbin/ip route | awk '/default/' | cut -d ' ' -f 3 | tr -d '\n'",
+                shell=True, stdout=subprocess.PIPE)
 
             addr = proc.stdout.read()
             return addr.decode("UTF-8")
         except Exception as e:
-            l.error(e)
+            log.error(e)
 
             return None
 
     def check_host(self, host):
-        l.debug("checking host", host)
+        log.debug("checking host", host)
 
         (_, h) = self.agent.request_header(
             self.agent.make_host_url(host, "/"), "GET", "Server")
@@ -106,7 +107,7 @@ def check_host(self, host):
         return h
 
     def announce_sensor(self, e):
-        l.debug("announcing sensor to the agent")
+        log.debug("announcing sensor to the agent")
         s = None
         pid = os.getpid()
 
@@ -135,23 +136,24 @@ def announce_sensor(self, e):
         if b:
             self.agent.set_from(b)
             self.fsm.ready()
-            l.warn("Host agent available. We're in business. Announced pid: %i (true pid: %i)" % (pid, self.agent.from_.pid))
+            log.warn("Host agent available. We're in business. Announced pid: %i (true pid: %i)" %
+                     (pid, self.agent.from_.pid))
             return True
         else:
-            l.warn("Cannot announce sensor. Scheduling retry.")
+            log.warn("Cannot announce sensor. Scheduling retry.")
             self.schedule_retry(self.announce_sensor, e, "announce")
         return False
 
     def schedule_retry(self, fun, e, name):
-        l.debug("Scheduling: " + name)
+        log.debug("Scheduling: " + name)
         self.timer = t.Timer(self.RETRY_PERIOD, fun, [e])
         self.timer.daemon = True
         self.timer.name = name
         self.timer.start()
-        l.debug('Threadlist: ', str(t.enumerate()))
+        log.debug('Threadlist: ', str(t.enumerate()))
 
     def test_agent(self, e):
-        l.debug("testing communication with the agent")
+        log.debug("testing communication with the agent")
 
         (b, _) = self.agent.head(self.agent.make_url(a.AGENT_DATA_URL))
 
diff --git a/instana/log.py b/instana/log.py
index 12c227d1..d6691ac5 100644
--- a/instana/log.py
+++ b/instana/log.py
@@ -1,16 +1,16 @@
-import logging as l
+import logging as log
 import os
 
-logger = l.getLogger('instana(' + str(os.getpid()) + ')')
+logger = log.getLogger('instana(' + str(os.getpid()) + ')')
 
 
 def init(level):
-    ch = l.StreamHandler()
-    f = l.Formatter('%(asctime)s: %(levelname)s: %(name)s: %(message)s')
+    ch = log.StreamHandler()
+    f = log.Formatter('%(asctime)s: %(levelname)s: %(name)s: %(message)s')
     ch.setFormatter(f)
     logger.addHandler(ch)
     if "INSTANA_DEV" in os.environ:
-        logger.setLevel(l.DEBUG)
+        logger.setLevel(log.DEBUG)
     else:
         logger.setLevel(level)
 
diff --git a/instana/meter.py b/instana/meter.py
index 1e6348ef..1fd48c72 100644
--- a/instana/meter.py
+++ b/instana/meter.py
@@ -1,5 +1,5 @@
 import threading as t
-import instana.log as l
+from instana import log
 import resource
 import os
 import gc as gc_
@@ -7,7 +7,6 @@
 import instana.agent_const as a
 import copy
 import time
-import json
 from types import ModuleType
 
 
@@ -178,7 +177,7 @@ def collect_snapshot(self):
 
             return s
         except Exception as e:
-            l.debug("collect_snapshot: ", str(e))
+            log.debug("collect_snapshot: ", str(e))
 
             return None
 
@@ -210,11 +209,11 @@ def collect_modules(self):
                             r[k] = "builtin"
                     except Exception as e:
                         r[k] = "unknown"
-                        l.debug("collect_modules: could not process module ", k, str(e))
+                        log.debug("collect_modules: could not process module ", k, str(e))
 
             return r
         except Exception as e:
-            l.debug("collect_modules: ", str(e))
+            log.debug("collect_modules: ", str(e))
 
             return None
 
diff --git a/instana/recorder.py b/instana/recorder.py
index e7d23170..a48b26a9 100644
--- a/instana/recorder.py
+++ b/instana/recorder.py
@@ -85,8 +85,8 @@ def build_registered_span(self, span):
                        baggage=span.context.baggage,
                        custom=sd.CustomData(tags=span.tags,
                                             logs=self.collect_logs(span)))
-        entityFrom = { 'e': self.sensor.agent.from_.pid,
-                       'h': self.sensor.agent.from_.agentUuid }
+        entityFrom = {'e': self.sensor.agent.from_.pid,
+                      'h': self.sensor.agent.from_.agentUuid}
 
         return sd.InstanaSpan(
                     n=span.operation_name,
@@ -114,8 +114,8 @@ def build_sdk_span(self, span):
 
         sdk_data.Type = self.get_span_kind(span)
         data = sd.Data(service=self.get_service_name(span), sdk=sdk_data)
-        entityFrom = { 'e': self.sensor.agent.from_.pid,
-                       'h': self.sensor.agent.from_.agentUuid }
+        entityFrom = {'e': self.sensor.agent.from_.pid,
+                      'h': self.sensor.agent.from_.agentUuid}
 
         return sd.InstanaSpan(
                     t=span.context.trace_id,
@@ -169,7 +169,7 @@ def collect_logs(self, span):
         logs = {}
         for l in span.logs:
             ts = int(round(l.timestamp * 1000))
-            if not ts in logs:
+            if ts not in logs:
                 logs[ts] = {}
 
             for f in l.key_values:
@@ -177,6 +177,7 @@ def collect_logs(self, span):
 
         return logs
 
+
 class InstanaSampler(Sampler):
 
     def sampled(self, _):
diff --git a/instana/runtime.py b/instana/runtime.py
index 30ffb25a..ed06ba21 100644
--- a/instana/runtime.py
+++ b/instana/runtime.py
@@ -1,6 +1,5 @@
 import opentracing as ot
 from instana import tracer, options
-import logging
 import os
 
 
diff --git a/instana/sensor.py b/instana/sensor.py
index 973e3ca5..f2baa95c 100644
--- a/instana/sensor.py
+++ b/instana/sensor.py
@@ -1,8 +1,7 @@
 import instana.options as o
-import instana.log as l
 import instana.meter as m
 import instana.agent as a
-import os
+from instana import log
 
 
 class Sensor(object):
@@ -13,12 +12,12 @@ class Sensor(object):
 
     def __init__(self, options):
         self.set_options(options)
-        l.init(options.log_level)
+        log.init(options.log_level)
         self.configure_service_name()
         self.agent = a.Agent(self)
         self.meter = m.Meter(self)
 
-        l.debug("initialized sensor")
+        log.debug("initialized sensor")
 
     def set_options(self, options):
         self.options = options
diff --git a/instana/wsgi.py b/instana/wsgi.py
index 801e828d..983ee1e3 100644
--- a/instana/wsgi.py
+++ b/instana/wsgi.py
@@ -1,7 +1,6 @@
 import opentracing as ot
 from instana import tracer, options
 import opentracing.ext.tags as tags
-import logging
 
 
 class iWSGIMiddleware(object):