Fix Python 3 support

django/db/migrations/autodetector.py

@@ -367,9 +367,9 @@ class InteractiveMigrationQuestioner(MigrationQuestioner):
         return result[0].lower() == "y"
 
     def _choice_input(self, question, choices):
-        print question
+        print(question)
         for i, choice in enumerate(choices):
-            print " %s) %s" % (i + 1, choice)
+            print(" %s) %s" % (i + 1, choice))
         result = input("Select an option: ")
         while True:
             try:

django/db/migrations/graph.py

@@ -70,7 +70,7 @@ class MigrationGraph(object):
         """
         roots = set()
         for node in self.nodes:
-            if not filter(lambda key: key[0] == node[0], self.dependencies.get(node, set())):
+            if not any(key[0] == node[0] for key in self.dependencies.get(node, set())):
                 roots.add(node)
         return roots
 
@@ -84,7 +84,7 @@ class MigrationGraph(object):
         """
         leaves = set()
         for node in self.nodes:
-            if not filter(lambda key: key[0] == node[0], self.dependents.get(node, set())):
+            if not any(key[0] == node[0] for key in self.dependents.get(node, set())):
                 leaves.add(node)
         return leaves
 

django/db/migrations/writer.py

@@ -109,7 +109,7 @@ class MigrationWriter(object):
         elif isinstance(value, (datetime.datetime, datetime.date)):
             return repr(value), set(["import datetime"])
         # Simple types
-        elif isinstance(value, (int, long, float, six.binary_type, six.text_type, bool, types.NoneType)):
+        elif isinstance(value, six.integer_types + (float, six.binary_type, six.text_type, bool, type(None))):
             return repr(value), set()
         # Django fields
         elif isinstance(value, models.Field):