diff --git a/joy/gui/world.py b/joy/gui/world.py
index 4fe4514..3045360 100644
--- a/joy/gui/world.py
+++ b/joy/gui/world.py
@@ -121,7 +121,6 @@ class World(object):
 
 class StackDisplayWorld(World):
 
-  
   def __init__(self, repo, filename, rel_filename, dictionary=None, text_widget=None):
     self.filename = filename
     stack = self.load_stack() or ()
diff --git a/joy/joy.py b/joy/joy.py
index 07ed9a6..dbad922 100644
--- a/joy/joy.py
+++ b/joy/joy.py
@@ -36,7 +36,7 @@ from .utils.pretty_print import TracePrinter
 
 def joy(stack, expression, dictionary, viewer=None):
   '''Evaluate the Joy expression on the stack.
-  
+
   The basic joy() function is quite straightforward.  It iterates through a
   sequence of terms which are either literals (strings, numbers, sequences)
   or functions.  Literals are put onto the stack and functions are
diff --git a/joy/library.py b/joy/library.py
index 61fd462..dc4f940 100644
--- a/joy/library.py
+++ b/joy/library.py
@@ -64,8 +64,8 @@ from .utils.types import (
   poly_combinator_effect,
   doc_from_stack_effect,
   )
-  
-  
+
+
 _SYM_NUMS = count().next
 _COMB_NUMS = count().next
 
@@ -243,7 +243,7 @@ make_generator == [codireco] ccons
 ifte == [nullary not] dipd branch
 '''
 #
-# 
+#
 # ifte == [nullary] dipd swap branch
 # genrec == [[genrec] cons cons cons cons] nullary swons concat ifte