diff --git a/components/style/counter_style/update_predefined.py b/components/style/counter_style/update_predefined.py
index 3e5be33e448..0185a8f8b42 100755
--- a/components/style/counter_style/update_predefined.py
+++ b/components/style/counter_style/update_predefined.py
@@ -28,5 +28,6 @@ predefined! {
             f.write('    "%s",\n' % name)
         f.write('}\n')
 
+
 if __name__ == "__main__":
     main(os.path.join(os.path.dirname(__file__), "predefined.rs"))
diff --git a/components/style/gecko/regen_atoms.py b/components/style/gecko/regen_atoms.py
index 36661215082..496c7be720a 100755
--- a/components/style/gecko/regen_atoms.py
+++ b/components/style/gecko/regen_atoms.py
@@ -21,7 +21,7 @@ PRELUDE = """
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /* Autogenerated file created by components/style/gecko/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
-"""[1:]
+"""[1:]   # NOQA: E501
 
 
 def gnu_symbolify(source, ident):
@@ -57,7 +57,7 @@ class CSSPseudoElementsAtomSource:
 
 
 class CSSAnonBoxesAtomSource:
-    PATTERN = re.compile('^(CSS_ANON_BOX|CSS_NON_INHERITING_ANON_BOX|CSS_WRAPPER_ANON_BOX)\(([^,]*),[^"]*"([^"]*)"\)',
+    PATTERN = re.compile('^(CSS_ANON_BOX|CSS_NON_INHERITING_ANON_BOX|CSS_WRAPPER_ANON_BOX)\(([^,]*),[^"]*"([^"]*)"\)',  # NOQA: E501
                          re.MULTILINE)
     FILE = "include/nsCSSAnonBoxList.h"
     CLASS = "nsCSSAnonBoxes"
diff --git a/components/style/properties/build.py b/components/style/properties/build.py
index 4f5da29246b..dd6b0d8d1bb 100644
--- a/components/style/properties/build.py
+++ b/components/style/properties/build.py
@@ -49,7 +49,8 @@ STYLE_STRUCT_LIST = [
 
 
 def main():
-    usage = "Usage: %s [ servo | gecko ] [ style-crate | geckolib <template> | html ]" % sys.argv[0]
+    usage = ("Usage: %s [ servo | gecko ] [ style-crate | geckolib <template> | html ]" %
+             sys.argv[0])
     if len(sys.argv) < 3:
         abort(usage)
     product = sys.argv[1]
@@ -122,7 +123,7 @@ def render(filename, **context):
         # Uncomment to debug generated Python code:
         # write("/tmp", "mako_%s.py" % os.path.basename(filename), template.code)
         return template.render(**context).encode("utf8")
-    except:
+    except Exception:
         # Uncomment to see a traceback in generated Python code:
         # raise
         abort(exceptions.text_error_template().render().encode("utf8"))
diff --git a/components/style/properties/data.py b/components/style/properties/data.py
index 57838655d8e..76713cfbcb5 100644
--- a/components/style/properties/data.py
+++ b/components/style/properties/data.py
@@ -75,7 +75,8 @@ class Keyword(object):
         self.name = name
         self.values = values.split()
         if gecko_constant_prefix and gecko_enum_prefix:
-            raise TypeError("Only one of gecko_constant_prefix and gecko_enum_prefix can be specified")
+            raise TypeError("Only one of gecko_constant_prefix and gecko_enum_prefix "
+                            "can be specified")
         self.gecko_constant_prefix = gecko_constant_prefix or \
             "NS_STYLE_" + self.name.upper().replace("-", "_")
         self.gecko_enum_prefix = gecko_enum_prefix
@@ -116,7 +117,8 @@ class Keyword(object):
             raise Exception("Bad product: " + product)
 
     def gecko_constant(self, value):
-        moz_stripped = value.replace("-moz-", '') if self.gecko_strip_moz_prefix else value.replace("-moz-", 'moz-')
+        moz_stripped = (value.replace("-moz-", '')
+                        if self.gecko_strip_moz_prefix else value.replace("-moz-", 'moz-'))
         mapped = self.consts_map.get(value)
         if self.gecko_enum_prefix:
             parts = moz_stripped.replace('-', '_').split('_')
@@ -167,7 +169,8 @@ class Longhand(object):
                  gecko_ffi_name=None,
                  allowed_in_keyframe_block=True, cast_type='u8',
                  logical=False, alias=None, extra_prefixes=None, boxed=False,
-                 flags=None, allowed_in_page_rule=False, allow_quirks=False, ignored_when_colors_disabled=False,
+                 flags=None, allowed_in_page_rule=False, allow_quirks=False,
+                 ignored_when_colors_disabled=False,
                  vector=False, servo_restyle_damage="repaint"):
         self.name = name
         if not spec: