bpo-29776: Use decorator syntax for properties. (#585)

diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index d49e8f0..ba9b17c 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -465,8 +465,13 @@
             self._listener = None
             listener.close()
 
-    address = property(lambda self: self._listener._address)
-    last_accepted = property(lambda self: self._listener._last_accepted)
+    @property
+    def address(self):
+        return self._listener._address
+
+    @property
+    def last_accepted(self):
+        return self._listener._last_accepted
 
     def __enter__(self):
         return self
diff --git a/Lib/multiprocessing/dummy/__init__.py b/Lib/multiprocessing/dummy/__init__.py
index 1abea64..cbb7f49 100644
--- a/Lib/multiprocessing/dummy/__init__.py
+++ b/Lib/multiprocessing/dummy/__init__.py
@@ -98,11 +98,15 @@
     def __init__(self, typecode, value, lock=True):
         self._typecode = typecode
         self._value = value
-    def _get(self):
+
+    @property
+    def value(self):
         return self._value
-    def _set(self, value):
+
+    @value.setter
+    def value(self, value):
         self._value = value
-    value = property(_get, _set)
+
     def __repr__(self):
         return '<%s(%r, %r)>'%(type(self).__name__,self._typecode,self._value)
 
diff --git a/Lib/multiprocessing/dummy/connection.py b/Lib/multiprocessing/dummy/connection.py
index 1984375..f0ce320 100644
--- a/Lib/multiprocessing/dummy/connection.py
+++ b/Lib/multiprocessing/dummy/connection.py
@@ -26,7 +26,9 @@
     def close(self):
         self._backlog_queue = None
 
-    address = property(lambda self: self._backlog_queue)
+    @property
+    def address(self):
+        return self._backlog_queue
 
     def __enter__(self):
         return self
diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py
index b9ce84b..43dd02a 100644
--- a/Lib/multiprocessing/managers.py
+++ b/Lib/multiprocessing/managers.py
@@ -628,7 +628,9 @@
         except KeyError:
             pass
 
-    address = property(lambda self: self._address)
+    @property
+    def address(self):
+        return self._address
 
     @classmethod
     def register(cls, typeid, callable=None, proxytype=None, exposed=None,