diff --git a/sloth/gui/annotationscene.py b/sloth/gui/annotationscene.py
index 69fc47d..3716bdb 100644
--- a/sloth/gui/annotationscene.py
+++ b/sloth/gui/annotationscene.py
@@ -1,6 +1,4 @@
 """This is the AnnotationScene module"""
-from PyQt4.QtGui import *
-from PyQt4.QtCore import *
 from sloth.items import *
 from sloth.core.exceptions import InvalidArgumentException
 from sloth.annotations.model import AnnotationModelItem
@@ -9,19 +7,20 @@ from sloth.conf import config
 import logging
 LOG = logging.getLogger(__name__)
 
+
 class AnnotationScene(QGraphicsScene):
     mousePositionChanged = pyqtSignal(float, float)
     def __init__(self, labeltool, items=None, inserters=None, parent=None):
         super(AnnotationScene, self).__init__(parent)
 
-        self._model      = None
+        self._model = None
         self._image_item = None
-        self._inserter   = None
+        self._inserter = None
         self._scene_item = None
-        self._message    = ""
-        self._labeltool  = labeltool
+        self._message = ""
+        self._labeltool = labeltool
 
-        self._itemfactory     = Factory(items)
+        self._itemfactory = Factory(items)
         self._inserterfactory = Factory(inserters)
 
         try:
@@ -268,7 +267,7 @@ class AnnotationScene(QGraphicsScene):
             found = False
 
         items = [item for item in self.items()
-                      if item.flags() & QGraphicsItem.ItemIsSelectable] * 2
+                 if item.flags() & QGraphicsItem.ItemIsSelectable] * 2
         if reverse:
             items.reverse()
 
diff --git a/sloth/gui/buttonarea.py b/sloth/gui/buttonarea.py
index 7e8e832..d8863b8 100644
--- a/sloth/gui/buttonarea.py
+++ b/sloth/gui/buttonarea.py
@@ -11,7 +11,8 @@ def unique_list(seq):
     seen = {}
     result = []
     for item in seq:
-        if item in seen: continue
+        if item in seen:
+            continue
         seen[item] = 1
         result.append(item)
     return result
@@ -186,7 +187,7 @@ class ButtonArea(QWidget):
     def clickedLabelButton(self, label_name):
         #button = self.get_checked_label_button()
         #print button
-        if label_name != None:
+        if label_name is not None:
             LOG.debug("ButtonArea: %s" % label_name)
             self.show_only_label_properties(label_name)
         else:
diff --git a/sloth/gui/controlbuttons.py b/sloth/gui/controlbuttons.py
index 4860903..5ddb06b 100644
--- a/sloth/gui/controlbuttons.py
+++ b/sloth/gui/controlbuttons.py
@@ -1,7 +1,7 @@
-import sys, os
 from PyQt4.QtGui import *
 from PyQt4.QtCore import *
 
+
 class Label(QLabel):
     
     def __init__(self, *args, **kwargs):
@@ -12,6 +12,7 @@ class Label(QLabel):
         menu.addActions(self.actions())
         menu.exec_(ev.globalPos())
 
+
 class ControlButtonWidget(QWidget):
     def __init__(self, parent=None):
         QWidget.__init__(self, parent)
diff --git a/sloth/gui/floatinglayout.py b/sloth/gui/floatinglayout.py
index 1680125..b64629a 100644
--- a/sloth/gui/floatinglayout.py
+++ b/sloth/gui/floatinglayout.py
@@ -1,6 +1,7 @@
 from PyQt4.QtCore import Qt, QRect, QSize, QPoint
 from PyQt4.QtGui  import QLayout, QSizePolicy, QWidgetItem
 
+
 class FloatingLayout(QLayout):
     def __init__(self, parent=None):
         QLayout.__init__(self, parent)
diff --git a/sloth/gui/utils.py b/sloth/gui/utils.py
index 766a4b5..28c8f93 100644
--- a/sloth/gui/utils.py
+++ b/sloth/gui/utils.py
@@ -1,5 +1,6 @@
 from PyQt4.QtCore import QSize
-from PyQt4.QtGui  import QVBoxLayout
+from PyQt4.QtGui import QVBoxLayout
+
 
 # This is really really ugly, but the QDockWidget for some reason does not notice when
 # its child widget becomes smaller...