--- a/tools/libglibcodegen.py
+++ b/tools/libglibcodegen.py
@@ -55,9 +55,8 @@
     return camelcase_to_lower(s).upper()
 
 
-def cmp_by_name(node1, node2):
-    return cmp(node1.getAttributeNode("name").nodeValue,
-               node2.getAttributeNode("name").nodeValue)
+def key_by_name(node):
+    return node.getAttributeNode("name").nodeValue
 
 
 def dbus_gutils_wincaps_to_uscore(s):
@@ -191,6 +191,9 @@
         self.remaining = string
 
     def next(self):
+        return self.__next__()
+
+    def __next__(self):
         if self.remaining == '':
             raise StopIteration
 
@@ -297,7 +297,7 @@
         return ("GHashTable *", "DBUS_TYPE_G_STRING_STRING_HASHTABLE", "BOXED", False)
     elif s[:2] == 'a{':  #some arbitrary hash tables
         if s[2] not in ('y', 'b', 'n', 'q', 'i', 'u', 's', 'o', 'g'):
-            raise Exception, "can't index a hashtable off non-basic type " + s
+            raise Exception("can't index a hashtable off non-basic type " + s)
         first = type_to_gtype(s[2])
         second = type_to_gtype(s[3:-1])
         return ("GHashTable *", "(dbus_g_type_get_map (\"GHashTable\", " + first[1] + ", " + second[1] + "))", "BOXED", False)
@@ -312,7 +312,7 @@
         return ("GValueArray *", gtype, "BOXED", True)
 
     # we just don't know ..
-    raise Exception, "don't know the GType for " + s
+    raise Exception("don't know the GType for " + s)
 
 
 def xml_escape(s):
--- a/tools/glib-signals-marshal-gen.py
+++ b/tools/glib-signals-marshal-gen.py
@@ -41,12 +41,12 @@
         for signal in signals:
             self.do_signal(signal)
 
-        all = self.marshallers.keys()
+        all = list(self.marshallers.keys())
         all.sort()
         for marshaller in all:
             rhs = self.marshallers[marshaller]
             if not marshaller.startswith('g_cclosure'):
-                print 'VOID:' + ','.join(rhs)
+                print('VOID:' + ','.join(rhs))
 
 if __name__ == '__main__':
     argv = sys.argv[1:]
--- a/tools/glib-ginterface-gen.py
+++ b/tools/glib-ginterface-gen.py
@@ -26,7 +26,7 @@
 import os.path
 import xml.dom.minidom
 
-from libglibcodegen import Signature, type_to_gtype, cmp_by_name, \
+from libglibcodegen import Signature, type_to_gtype, key_by_name, \
         camelcase_to_lower, NS_TP, dbus_gutils_wincaps_to_uscore, \
         signal_to_marshal_name, method_to_glue_marshal_name
 
@@ -620,7 +620,7 @@
         self.b('')
 
         nodes = self.dom.getElementsByTagName('node')
-        nodes.sort(cmp_by_name)
+        nodes.sort(key=key_by_name)
 
         for node in nodes:
             self.do_node(node)
@@ -639,7 +639,7 @@
 
 
 def cmdline_error():
-    print """\
+    print("""\
 usage:
     gen-ginterface [OPTIONS] xmlfile Prefix_
 options:
@@ -659,7 +659,7 @@
             void symbol (DBusGMethodInvocation *context)
         and return some sort of "not implemented" error via
             dbus_g_method_return_error (context, ...)
-"""
+""")
     sys.exit(1)