diff --git a/src/calibre/ebooks/lrf/pylrs/pylrfopt.py b/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
index 35b02c1971..b9a1e8101a 100644
--- a/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
+++ b/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
@@ -1,5 +1,6 @@
 from __future__ import absolute_import, division, print_function, unicode_literals
 
+
 def _optimize(tagList, tagName, conversion):
     # copy the tag of interest plus any text
     newTagList = []
diff --git a/src/calibre/ebooks/oeb/normalize_css.py b/src/calibre/ebooks/oeb/normalize_css.py
index 3b9ee27d28..c550bd42e9 100644
--- a/src/calibre/ebooks/oeb/normalize_css.py
+++ b/src/calibre/ebooks/oeb/normalize_css.py
@@ -393,7 +393,8 @@ def test_normalization(return_tests=False):  # {{{
                 tuple('0 0 0 0'.split()) : '0',
             }):
                 for prefix in ('margin', 'padding'):
-                    css = {'%s-%s' % (prefix, x) : unicode_type(y)+'pt' if isinstance(y, numbers.Number) else y for x, y in zip(('left', 'top', 'right', 'bottom'), s)}
+                    css = {'%s-%s' % (prefix, x) : unicode_type(y)+'pt' if isinstance(y, numbers.Number) else y
+                            for x, y in zip(('left', 'top', 'right', 'bottom'), s)}
                     css = '; '.join(('%s:%s' % (k, v) for k, v in iteritems(css)))
                     style = parseStyle(css)
                     condense_rule(style)