diff --git a/owslib/catalogue/csw2.py b/owslib/catalogue/csw2.py
index 2a56b541..e09555b7 100644
--- a/owslib/catalogue/csw2.py
+++ b/owslib/catalogue/csw2.py
@@ -20,8 +20,8 @@
 from owslib import util
 from owslib import ows
 from owslib.iso import MD_Metadata, FC_FeatureCatalogue
-from owslib.iso_3 import MD_Metadata as MD_Metadata_3 # ISO 19115 Part 3 XML
-from owslib.iso_3 import FC_FeatureCatalogue as FC_FeatureCatalogue_3 # ISO 19115 Part 3 XML
+from owslib.iso_3 import MD_Metadata as MD_Metadata_3  # ISO 19115 Part 3 XML
+from owslib.iso_3 import FC_FeatureCatalogue as FC_FeatureCatalogue_3  # ISO 19115 Part 3 XML
 from owslib.fgdc import Metadata
 from owslib.dif import DIF
 from owslib.gm03 import GM03
@@ -580,7 +580,7 @@ def _parserecords(self, outputschema, esn):
                 val = i.find(util.nspath_eval('gm03:fileIdentifier', namespaces))
                 identifier = self._setidentifierkey(util.testXMLValue(val))
                 self.records[identifier] = GM03(i)
-        elif MD_Metadata_3.handles(outputschema): # ISO 19115 Part 3 XML
+        elif MD_Metadata_3.handles(outputschema):  # ISO 19115 Part 3 XML
             for elem, id in MD_Metadata_3.find_ids(self._exml):
                 self.records[self._setidentifierkey(id)] = MD_Metadata_3(elem)
             for i in self._exml.findall('.//' + util.nspath_eval('gfc:FC_FeatureCatalogue', namespaces)):
diff --git a/owslib/catalogue/csw3.py b/owslib/catalogue/csw3.py
index 312551ec..77dbc36e 100644
--- a/owslib/catalogue/csw3.py
+++ b/owslib/catalogue/csw3.py
@@ -20,8 +20,8 @@
 from owslib import util
 from owslib import ows
 from owslib.iso import MD_Metadata, FC_FeatureCatalogue
-from owslib.iso_3 import MD_Metadata as MD_Metadata_3 # ISO 19115 Part 3 XML
-from owslib.iso_3 import FC_FeatureCatalogue as FC_FeatureCatalogue_3 # ISO 19115 Part 3 XML
+from owslib.iso_3 import MD_Metadata as MD_Metadata_3  # ISO 19115 Part 3 XML
+from owslib.iso_3 import FC_FeatureCatalogue as FC_FeatureCatalogue_3  # ISO 19115 Part 3 XML
 from owslib.fgdc import Metadata
 from owslib.dif import DIF
 from owslib.gm03 import GM03
@@ -479,7 +479,7 @@ def _parserecords(self, outputschema, esn):
                 val = i.find(util.nspath_eval('gm03:fileIdentifier', namespaces))
                 identifier = self._setidentifierkey(util.testXMLValue(val))
                 self.records[identifier] = GM03(i)
-        elif MD_Metadata_3.handles(outputschema): # ISO 19115 Part 3 XML
+        elif MD_Metadata_3.handles(outputschema):  # ISO 19115 Part 3 XML
             for elem, id in MD_Metadata_3.find_ids(self._exml):
                 self.records[self._setidentifierkey(id)] = MD_Metadata_3(elem)
             for i in self._exml.findall('.//' + util.nspath_eval('gfc:FC_FeatureCatalogue', namespaces)):
diff --git a/owslib/feature/wfs100.py b/owslib/feature/wfs100.py
index 7baba92d..11d181c1 100644
--- a/owslib/feature/wfs100.py
+++ b/owslib/feature/wfs100.py
@@ -25,7 +25,7 @@
 from owslib.etree import etree
 from owslib.fgdc import Metadata
 from owslib.iso import MD_Metadata
-from owslib.iso_3 import MD_Metadata as MD_Metadata_3 # ISO 19115 Part 3 XML
+from owslib.iso_3 import MD_Metadata as MD_Metadata_3  # ISO 19115 Part 3 XML
 from owslib.crs import Crs
 from owslib.namespaces import Namespaces
 from owslib.feature.schema import get_schema
diff --git a/owslib/feature/wfs110.py b/owslib/feature/wfs110.py
index 268467d4..0977cf75 100644
--- a/owslib/feature/wfs110.py
+++ b/owslib/feature/wfs110.py
@@ -18,7 +18,7 @@
 from owslib.etree import etree
 from owslib.fgdc import Metadata
 from owslib.iso import MD_Metadata
-from owslib.iso_3 import MD_Metadata as MD_Metadata_3 # ISO 19115 Part 3 XML
+from owslib.iso_3 import MD_Metadata as MD_Metadata_3  # ISO 19115 Part 3 XML
 from owslib.ows import (
     OwsCommon,
     ServiceIdentification,
diff --git a/owslib/map/wms130.py b/owslib/map/wms130.py
index c787dc92..d2faaf43 100644
--- a/owslib/map/wms130.py
+++ b/owslib/map/wms130.py
@@ -23,7 +23,7 @@
                          nspath_eval, bind_url, Authentication)
 from owslib.fgdc import Metadata
 from owslib.iso import MD_Metadata
-from owslib.iso_3 import MD_Metadata as MD_Metadata_3 # ISO 19115 Part 3 XML
+from owslib.iso_3 import MD_Metadata as MD_Metadata_3  # ISO 19115 Part 3 XML
 from owslib.crs import Crs
 from owslib.namespaces import Namespaces
 from owslib.map.common import WMSCapabilitiesReader, AbstractContentMetadata