Use true booleans and PEP8 for argdefaults.
diff --git a/Lib/xml/dom/minidom.py b/Lib/xml/dom/minidom.py
index 77a44f5..f4f4400 100644
--- a/Lib/xml/dom/minidom.py
+++ b/Lib/xml/dom/minidom.py
@@ -43,7 +43,7 @@
     def __bool__(self):
         return True
 
-    def toxml(self, encoding = None):
+    def toxml(self, encoding=None):
         return self.toprettyxml("", "", encoding)
 
     def toprettyxml(self, indent="\t", newl="\n", encoding=None):