Fix issue 9794: adds context manager protocol to socket.socket so that socket.create_connection() can be used with the 'with' statement.

Lib/test/test_socket.py

@@ -1595,6 +1595,49 @@ class TIPCThreadableTest (unittest.TestCase, ThreadableTest):
         self.cli.close()
 
 
+@unittest.skipUnless(thread, 'Threading required for this test.')
+class ContextManagersTest(ThreadedTCPSocketTest):
+
+    def _testSocketClass(self):
+        # base test
+        with socket.socket() as sock:
+            self.assertFalse(sock._closed)
+        self.assertTrue(sock._closed)
+        # close inside with block
+        with socket.socket() as sock:
+            sock.close()
+        self.assertTrue(sock._closed)
+        # exception inside with block
+        with socket.socket() as sock:
+            self.assertRaises(socket.error, sock.sendall, b'foo')
+        self.assertTrue(sock._closed)
+
+    def testCreateConnectionBase(self):
+        conn, addr = self.serv.accept()
+        data = conn.recv(1024)
+        conn.sendall(data)
+
+    def _testCreateConnectionBase(self):
+        address = self.serv.getsockname()
+        with socket.create_connection(address) as sock:
+            self.assertFalse(sock._closed)
+            sock.sendall(b'foo')
+            self.assertEqual(sock.recv(1024), b'foo')
+        self.assertTrue(sock._closed)
+
+    def testCreateConnectionClose(self):
+        conn, addr = self.serv.accept()
+        data = conn.recv(1024)
+        conn.sendall(data)
+
+    def _testCreateConnectionClose(self):
+        address = self.serv.getsockname()
+        with socket.create_connection(address) as sock:
+            sock.close()
+        self.assertTrue(sock._closed)
+        self.assertRaises(socket.error, sock.sendall, b'foo')
+
+
 def test_main():
     tests = [GeneralModuleTests, BasicTCPTest, TCPCloserTest, TCPTimeoutTest,
              TestExceptions, BufferIOTest, BasicTCPTest2, BasicUDPTest, UDPTimeoutTest ]
@@ -1609,6 +1652,7 @@ def test_main():
         NetworkConnectionNoServer,
         NetworkConnectionAttributesTest,
         NetworkConnectionBehaviourTest,
+        ContextManagersTest,
     ])
     if hasattr(socket, "socketpair"):
         tests.append(BasicSocketPairTest)