diff --git a/src/calibre/utils/formatter.py b/src/calibre/utils/formatter.py
index 07da6ee481..150ad79e57 100644
--- a/src/calibre/utils/formatter.py
+++ b/src/calibre/utils/formatter.py
@@ -926,7 +926,7 @@ class _Interpreter(object):
                 else:
                     res = unicode_type(res)
             else:
-                res = unicode_type(res) # Should be the string "None"
+                res = unicode_type(res)  # Should be the string "None"
             if (self.break_reporter):
                 self.break_reporter(prog.node_name, res, prog.line_number)
             return res
@@ -991,7 +991,6 @@ class _Interpreter(object):
             self.break_reporter(prog.node_name, res, prog.line_number)
         return res
 
-
     LOGICAL_BINARY_OPS = {
         'and': lambda self, x, y: self.expr(x) and self.expr(y),
         'or': lambda self, x, y: self.expr(x) or self.expr(y),