diff --git a/netdiff/exceptions.py b/netdiff/exceptions.py
index 9ea8372..a8bad6d 100644
--- a/netdiff/exceptions.py
+++ b/netdiff/exceptions.py
@@ -1,5 +1,5 @@
 class NetdiffException(Exception):
-    """ root netdiff exception """
+    """root netdiff exception"""
 
     pass
 
diff --git a/netdiff/parsers/batman.py b/netdiff/parsers/batman.py
index eeb87e5..dae00ce 100644
--- a/netdiff/parsers/batman.py
+++ b/netdiff/parsers/batman.py
@@ -3,7 +3,7 @@
 
 
 class BatmanParser(BaseParser):
-    """ batman-adv parser """
+    """batman-adv parser"""
 
     protocol = 'batman-adv'
     version = '2015.0'
diff --git a/netdiff/parsers/bmx6.py b/netdiff/parsers/bmx6.py
index dbd107c..a93bde2 100644
--- a/netdiff/parsers/bmx6.py
+++ b/netdiff/parsers/bmx6.py
@@ -3,7 +3,7 @@
 
 
 class Bmx6Parser(BaseParser):
-    """ Bmx6_b6m parser """
+    """Bmx6_b6m parser"""
 
     protocol = 'BMX6_b6m'
     version = '0'
diff --git a/netdiff/parsers/cnml.py b/netdiff/parsers/cnml.py
index 33cc62f..ec8b488 100644
--- a/netdiff/parsers/cnml.py
+++ b/netdiff/parsers/cnml.py
@@ -12,7 +12,7 @@
 
 
 class CnmlParser(BaseParser):
-    """ CNML 0.1 parser """
+    """CNML 0.1 parser"""
 
     protocol = 'static'
     version = None
diff --git a/netdiff/parsers/netjson.py b/netdiff/parsers/netjson.py
index d29fd9a..ccfc5d3 100644
--- a/netdiff/parsers/netjson.py
+++ b/netdiff/parsers/netjson.py
@@ -3,7 +3,7 @@
 
 
 class NetJsonParser(BaseParser):
-    """ NetJSON (0.1) parser """
+    """NetJSON (0.1) parser"""
 
     def parse(self, data):
         """
diff --git a/netdiff/parsers/olsr.py b/netdiff/parsers/olsr.py
index 9d2d11d..2314433 100644
--- a/netdiff/parsers/olsr.py
+++ b/netdiff/parsers/olsr.py
@@ -3,7 +3,7 @@
 
 
 class OlsrParser(BaseParser):
-    """ OLSR 1 jsoninfo parser """
+    """OLSR 1 jsoninfo parser"""
 
     protocol = 'OLSR'
     version = '0.8'
diff --git a/netdiff/parsers/openvpn.py b/netdiff/parsers/openvpn.py
index f10dbbd..4707ca0 100644
--- a/netdiff/parsers/openvpn.py
+++ b/netdiff/parsers/openvpn.py
@@ -6,7 +6,7 @@
 
 
 class OpenvpnParser(BaseParser):
-    """ OpenVPN status log parser """
+    """OpenVPN status log parser"""
 
     protocol = 'OpenVPN Status Log'
     version = '1'
diff --git a/netdiff/tests.py b/netdiff/tests.py
index 26ba6ac..9ffc563 100644
--- a/netdiff/tests.py
+++ b/netdiff/tests.py
@@ -4,7 +4,7 @@
 
 
 class TestCase(unittest.TestCase):
-    """ netdiff TestCase """
+    """netdiff TestCase"""
 
     def _test_expected_links(self, graph, expected_links):
         """
diff --git a/tests/test_base.py b/tests/test_base.py
index 3fc82a9..2a59c7b 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -17,7 +17,7 @@
 
 
 class TestBaseParser(unittest.TestCase):
-    """ BaseParser tests """
+    """BaseParser tests"""
 
     def _load_contents(self, file):
         return open(os.path.abspath(file)).read()
diff --git a/tests/test_batman.py b/tests/test_batman.py
index 65c68d1..1765219 100644
--- a/tests/test_batman.py
+++ b/tests/test_batman.py
@@ -13,7 +13,7 @@
 
 
 class TestBatmanParser(TestCase):
-    """ tests for BatmanParser """
+    """tests for BatmanParser"""
 
     def test_parse(self):
         p = BatmanParser(iulinet)
diff --git a/tests/test_utils.py b/tests/test_utils.py
index b0fc5f7..4a3ea14 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -8,7 +8,7 @@
 
 
 class TestUtils(TestCase):
-    """ tests for netdiff.utils """
+    """tests for netdiff.utils"""
 
     def test_same_nodes_but_added_links(self):
         """