Fix #1149: Publish ClientSession.loop property

CHANGES.rst

@@ -116,6 +116,8 @@ CHANGES
 
 - Add `multipart` coroutine method for web Request object #1067
 
+- Publish ClientSession.loop property #1149
+
 -
 
 -

aiohttp/client.py

@@ -476,6 +476,11 @@ def version(self):
         """The session HTTP protocol version."""
         return self._version
 
+    @property
+    def loop(self):
+        """Session's loop."""
+        return self._loop
+
     def detach(self):
         """Detach connector from session without closing the former.
 

docs/client_reference.rst

@@ -120,6 +120,11 @@ The client session supports the context manager protocol for self closing.
       A read-only property. Overriding `session.cookies = new_val` is
       forbidden, but you may modify the object in-place if needed.
 
+   .. attribute:: loop
+
+      A loop instance used for session creation.
+
+      A read-only property.
 
    .. comethod:: request(method, url, *, params=None, data=None,\
                          headers=None, skip_auto_headers=None, \

tests/test_client_session.py

@@ -418,3 +418,8 @@ def handler(request):
 def test_session_default_version(loop):
     session = aiohttp.ClientSession(loop=loop)
     assert session.version == aiohttp.HttpVersion11
+
+
+def test_session_loop(loop):
+    session = aiohttp.ClientSession(loop=loop)
+    assert session.loop is loop