Fix style errors

expansion/expansion.py

@@ -282,7 +282,8 @@ def ExpandJinja(file_name, source_template, resource, imports):
     """
 
     try:
-        jinja_imports = { i['path']: i['content'] for _, i in imports.iteritems() }
+        jinja_imports = (
+            {i['path']: i['content'] for _, i in imports.iteritems()})
         env = jinja2.Environment(loader=jinja2.DictLoader(jinja_imports))
 
         template = env.from_string(source_template)