Use true booleans and PEP8 for argdefaults.
diff --git a/Lib/xml/sax/saxutils.py b/Lib/xml/sax/saxutils.py
index e5d43a5..e845015 100644
--- a/Lib/xml/sax/saxutils.py
+++ b/Lib/xml/sax/saxutils.py
@@ -268,7 +268,7 @@
 
 # --- Utility functions
 
-def prepare_input_source(source, base = ""):
+def prepare_input_source(source, base=""):
     """This function takes an InputSource and an optional base URL and
     returns a fully resolved InputSource object ready for reading."""