diff --git a/qutebrowser/network/networkmanager.py b/qutebrowser/network/networkmanager.py
index c8f2bd547..75e7016eb 100644
--- a/qutebrowser/network/networkmanager.py
+++ b/qutebrowser/network/networkmanager.py
@@ -63,8 +63,8 @@ class NetworkManager(QNetworkAccessManager):
 
         """
         scheme = req.url().scheme()
-        logging.debug("new req, scheme {}, handlers {}".format(scheme,
-            self._scheme_handlers))
+        logging.debug("new req, scheme {}, handlers {}".format(
+            scheme, self._scheme_handlers))
         if scheme in self._scheme_handlers:
             reply = self._scheme_handlers[scheme].createRequest(
                 op, req, outgoing_data)
diff --git a/qutebrowser/network/qutescheme.py b/qutebrowser/network/qutescheme.py
index 548a7bf33..694d07e82 100644
--- a/qutebrowser/network/qutescheme.py
+++ b/qutebrowser/network/qutescheme.py
@@ -102,10 +102,8 @@ class QuteSchemeHandler(SchemeHandler):
             A QNetworkReply.
 
         """
-
         # FIXME handle unknown pages
         # FIXME adjust URLutils based on handlers
-
         logging.debug('request: {}'.format(request))
         data = handle(urlstring(request.url()))
         return SpecialNetworkReply(request, data, "text/html", self.parent())
diff --git a/qutebrowser/network/schemehandler.py b/qutebrowser/network/schemehandler.py
index 3a78c88d1..4d803c42f 100644
--- a/qutebrowser/network/schemehandler.py
+++ b/qutebrowser/network/schemehandler.py
@@ -20,16 +20,15 @@
 
 """Base class for custom scheme handlers."""
 
-import logging
-
 from PyQt5.QtNetwork import QNetworkReply, QNetworkRequest
 from PyQt5.QtCore import pyqtSlot, QObject, QIODevice, QByteArray, QTimer
 
+
 class SchemeHandler(QObject):
 
     """Abstract base class for custom scheme handlers."""
 
-    def createRequest(self, op, request, outgoingData=None):
+    def createRequest(self, op, request, outgoingData):
         """Create a new request.
 
         Args:
@@ -43,11 +42,11 @@ class SchemeHandler(QObject):
         Raise:
             NotImplementedError because this needs to be overwritten by
             subclasses.
+
         """
         raise NotImplementedError
 
 
-
 class SpecialNetworkReply(QNetworkReply):
 
     """QNetworkReply subclass for special data."""
@@ -77,6 +76,8 @@ class SpecialNetworkReply(QNetworkReply):
                        QByteArray.number(len(fileData)))
         self.setAttribute(QNetworkRequest.HttpStatusCodeAttribute, 200)
         self.setAttribute(QNetworkRequest.HttpReasonPhraseAttribute, "OK")
+        # For some reason, a segfault will be triggered if these lambdas aren't
+        # there.        pylint: disable=unnecessary-lambda
         QTimer.singleShot(0, lambda: self.metaDataChanged.emit())
         QTimer.singleShot(0, lambda: self.readyRead.emit())
         QTimer.singleShot(0, lambda: self.finished.emit())
@@ -93,7 +94,6 @@ class SpecialNetworkReply(QNetworkReply):
             bytes available (int)
 
         """
-        logging.debug("bytes available: {}".format(len(self._data)))
         return len(self._data) + super().bytesAvailable()
 
     def readData(self, maxlen):
@@ -108,7 +108,6 @@ class SpecialNetworkReply(QNetworkReply):
         """
         len_ = min(maxlen, len(self._data))
         buf = bytes(self._data[:len_])
-        logging.debug("readdata, len {}, maxlen {}, buf {}".format(len(self._data), maxlen, buf))
         self._data = self._data[len_:]
         return buf
 
diff --git a/qutebrowser/utils/config.py b/qutebrowser/utils/config.py
index d27980e24..9b319545f 100644
--- a/qutebrowser/utils/config.py
+++ b/qutebrowser/utils/config.py
@@ -261,7 +261,7 @@ class Config(ConfigParser):
                                        not self.always_save):
             logging.warning("Not saving config (dir {}, config {})".format(
                 self._configdir, 'loaded' if self._config_loaded
-                                  else 'not loaded'))
+                else 'not loaded'))
             return
         if not os.path.exists(self._configdir):
             os.makedirs(self._configdir, 0o755)