update comparison to follow pep8

diff --git a/tornado/template.py b/tornado/template.py
index 865f80ace4f2f4b814023b15c2d68d12051755a7..341e07c62fda8290bf5d9d4cc16d074ede9661c4 100644 (file)
--- a/tornado/template.py
+++ b/tornado/template.py
@@ -618,7 +618,7 @@ class _CodeWriter(object):
         return IncludeTemplate()
 
     def write_line(self, line, line_number, indent=None):
-        if indent == None:
+        if indent is None:
             indent = self._indent
         line_comment = '  # %s:%d' % (self.current_template.name, line_number)
         if self.include_stack: