Convert a pile of obvious "yes/no" functions to return bool.
diff --git a/Lib/threading.py b/Lib/threading.py
index 9763c62..706d5bb 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -174,9 +174,9 @@
     def _is_owned(self):
         if self.__lock.acquire(0):
             self.__lock.release()
-            return 0
+            return False
         else:
-            return 1
+            return True
 
     def wait(self, timeout=None):
         me = currentThread()