Update singleton_thread_locals.py (#252)

* Update singleton_thread_locals.py

fix

* Update singleton_thread_locals.py

* Update singleton_thread_locals.py

examples/providers/singleton_thread_locals.py

@@ -1,26 +1,26 @@
 """`ThreadLocalSingleton` providers example."""
 
 import threading
-import Queue
+import queue
 
 import dependency_injector.providers as providers
 
 
-def example(example_object, queue):
+def example(example_object, queue_object):
     """Put provided object in the provided queue."""
-    queue.put(example_object)
+    queue_object.put(example_object)
 
 
 # Create thread-local singleton provider for some object (main thread):
 thread_local_object = providers.ThreadLocalSingleton(object)
 
 # Create singleton provider for thread-safe queue:
-queue = providers.Singleton(Queue.Queue)
+queue_factory = providers.ThreadSafeSingleton(queue.Queue)
 
 # Create callable provider for example(), inject dependencies:
 example = providers.DelegatedCallable(example,
                                       example_object=thread_local_object,
-                                      queue=queue)
+                                      queue_object=queue_factory)
 
 # Create factory provider for threads that are targeted to execute example():
 thread_factory = providers.Factory(threading.Thread,
@@ -43,8 +43,8 @@ if __name__ == '__main__':
     # Making some asserts (main thread):
     all_objects = set()
 
-    while not queue().empty():
-        all_objects.add(queue().get())
+    while not queue_factory().empty():
+        all_objects.add(queue_factory().get())
 
     assert len(all_objects) == len(threads)
     # Queue contains same number of objects as number of threads where