diff --git a/letsencrypt/display/util.py b/letsencrypt/display/util.py
index 3913f8bf1..05e280118 100644
--- a/letsencrypt/display/util.py
+++ b/letsencrypt/display/util.py
@@ -127,7 +127,6 @@ class NcursesDisplay(object):
 
             return code, int(index) - 1
 
-
     def input(self, message, **unused_kwargs):
         """Display an input box to the user.
 
@@ -141,11 +140,10 @@ class NcursesDisplay(object):
         """
         sections = message.split("\n")
         # each section takes at least one line, plus extras if it's longer than self.width
-        wordlines = [1 + (len(section)/self.width) for section in sections]
+        wordlines = [1 + (len(section) / self.width) for section in sections]
         height = 6 + sum(wordlines) + len(sections)
         return self.dialog.inputbox(message, width=self.width, height=height)
 
-
     def yesno(self, message, yes_label="Yes", no_label="No", **unused_kwargs):
         """Display a Yes/No dialog box.
 
@@ -397,7 +395,6 @@ class FileDisplay(object):
 
         self.outfile.write(side_frame)
 
-
     def _get_valid_int_ans(self, max_):
         """Get a numerical selection.
 
@@ -433,6 +430,7 @@ class FileDisplay(object):
 
         return OK, selection
 
+
 @zope.interface.implementer(interfaces.IDisplay)
 class NoninteractiveDisplay(object):
     """An iDisplay implementation that never asks for interactive user input"""
@@ -507,7 +505,6 @@ class NoninteractiveDisplay(object):
         else:
             return OK, default
 
-
     def yesno(self, message, yes_label=None, no_label=None, default=None, cli_flag=None):
         # pylint: disable=unused-argument
         """Decide Yes or No, without asking anybody