bpo-22831: Use "with" to avoid possible fd leaks in tests (part 2). (GH-10929)

Lib/test/support/__init__.py

@@ -706,9 +706,8 @@ def find_unused_port(family=socket.AF_INET, socktype=socket.SOCK_STREAM):
     issue if/when we come across it.
     """
 
-    tempsock = socket.socket(family, socktype)
-    port = bind_port(tempsock)
-    tempsock.close()
+    with socket.socket(family, socktype) as tempsock:
+        port = bind_port(tempsock)
     del tempsock
     return port
 
@@ -1785,10 +1784,11 @@ class _MemoryWatchdog:
             sys.stderr.flush()
             return
 
-        watchdog_script = findfile("memory_watchdog.py")
-        self.mem_watchdog = subprocess.Popen([sys.executable, watchdog_script],
-                                             stdin=f, stderr=subprocess.DEVNULL)
-        f.close()
+        with f:
+            watchdog_script = findfile("memory_watchdog.py")
+            self.mem_watchdog = subprocess.Popen([sys.executable, watchdog_script],
+                                                 stdin=f,
+                                                 stderr=subprocess.DEVNULL)
         self.started = True
 
     def stop(self):

Lib/test/support/script_helper.py

@@ -205,31 +205,28 @@ def make_script(script_dir, script_basename, source, omit_suffix=False):
         script_filename += os.extsep + 'py'
     script_name = os.path.join(script_dir, script_filename)
     # The script should be encoded to UTF-8, the default string encoding
-    script_file = open(script_name, 'w', encoding='utf-8')
-    script_file.write(source)
-    script_file.close()
+    with open(script_name, 'w', encoding='utf-8') as script_file:
+        script_file.write(source)
     importlib.invalidate_caches()
     return script_name
 
 def make_zip_script(zip_dir, zip_basename, script_name, name_in_zip=None):
     zip_filename = zip_basename+os.extsep+'zip'
     zip_name = os.path.join(zip_dir, zip_filename)
-    zip_file = zipfile.ZipFile(zip_name, 'w')
-    if name_in_zip is None:
-        parts = script_name.split(os.sep)
-        if len(parts) >= 2 and parts[-2] == '__pycache__':
-            legacy_pyc = make_legacy_pyc(source_from_cache(script_name))
-            name_in_zip = os.path.basename(legacy_pyc)
-            script_name = legacy_pyc
-        else:
-            name_in_zip = os.path.basename(script_name)
-    zip_file.write(script_name, name_in_zip)
-    zip_file.close()
+    with zipfile.ZipFile(zip_name, 'w') as zip_file:
+        if name_in_zip is None:
+            parts = script_name.split(os.sep)
+            if len(parts) >= 2 and parts[-2] == '__pycache__':
+                legacy_pyc = make_legacy_pyc(source_from_cache(script_name))
+                name_in_zip = os.path.basename(legacy_pyc)
+                script_name = legacy_pyc
+            else:
+                name_in_zip = os.path.basename(script_name)
+        zip_file.write(script_name, name_in_zip)
     #if test.support.verbose:
-    #    zip_file = zipfile.ZipFile(zip_name, 'r')
-    #    print 'Contents of %r:' % zip_name
-    #    zip_file.printdir()
-    #    zip_file.close()
+    #    with zipfile.ZipFile(zip_name, 'r') as zip_file:
+    #        print 'Contents of %r:' % zip_name
+    #        zip_file.printdir()
     return zip_name, os.path.join(zip_name, name_in_zip)
 
 def make_pkg(pkg_dir, init_source=''):
@@ -252,17 +249,15 @@ def make_zip_pkg(zip_dir, zip_basename, pkg_name, script_basename,
     script_name_in_zip = os.path.join(pkg_names[-1], os.path.basename(script_name))
     zip_filename = zip_basename+os.extsep+'zip'
     zip_name = os.path.join(zip_dir, zip_filename)
-    zip_file = zipfile.ZipFile(zip_name, 'w')
-    for name in pkg_names:
-        init_name_in_zip = os.path.join(name, init_basename)
-        zip_file.write(init_name, init_name_in_zip)
-    zip_file.write(script_name, script_name_in_zip)
-    zip_file.close()
+    with zipfile.ZipFile(zip_name, 'w') as zip_file:
+        for name in pkg_names:
+            init_name_in_zip = os.path.join(name, init_basename)
+            zip_file.write(init_name, init_name_in_zip)
+        zip_file.write(script_name, script_name_in_zip)
     for name in unlink:
         os.unlink(name)
     #if test.support.verbose:
-    #    zip_file = zipfile.ZipFile(zip_name, 'r')
-    #    print 'Contents of %r:' % zip_name
-    #    zip_file.printdir()
-    #    zip_file.close()
+    #    with zipfile.ZipFile(zip_name, 'r') as zip_file:
+    #        print 'Contents of %r:' % zip_name
+    #        zip_file.printdir()
     return zip_name, os.path.join(zip_name, script_name_in_zip)

Lib/test/test_argparse.py

@@ -1379,9 +1379,8 @@ class TestArgumentsFromFile(TempDirMixin, ParserTestCase):
             ('invalid', '@no-such-path\n'),
         ]
         for path, text in file_texts:
-            file = open(path, 'w')
-            file.write(text)
-            file.close()
+            with open(path, 'w') as file:
+                file.write(text)
 
     parser_signature = Sig(fromfile_prefix_chars='@')
     argument_signatures = [
@@ -1410,9 +1409,8 @@ class TestArgumentsFromFileConverter(TempDirMixin, ParserTestCase):
             ('hello', 'hello world!\n'),
         ]
         for path, text in file_texts:
-            file = open(path, 'w')
-            file.write(text)
-            file.close()
+            with open(path, 'w') as file:
+                file.write(text)
 
     class FromFileConverterArgumentParser(ErrorRaisingArgumentParser):
 
@@ -1493,9 +1491,8 @@ class TestFileTypeR(TempDirMixin, ParserTestCase):
     def setUp(self):
         super(TestFileTypeR, self).setUp()
         for file_name in ['foo', 'bar']:
-            file = open(os.path.join(self.temp_dir, file_name), 'w')
-            file.write(file_name)
-            file.close()
+            with open(os.path.join(self.temp_dir, file_name), 'w') as file:
+                file.write(file_name)
         self.create_readonly_file('readonly')
 
     argument_signatures = [
@@ -1534,9 +1531,8 @@ class TestFileTypeRB(TempDirMixin, ParserTestCase):
     def setUp(self):
         super(TestFileTypeRB, self).setUp()
         for file_name in ['foo', 'bar']:
-            file = open(os.path.join(self.temp_dir, file_name), 'w')
-            file.write(file_name)
-            file.close()
+            with open(os.path.join(self.temp_dir, file_name), 'w') as file:
+                file.write(file_name)
 
     argument_signatures = [
         Sig('-x', type=argparse.FileType('rb')),

Lib/test/test_binhex.py

@@ -23,17 +23,15 @@ class BinHexTestCase(unittest.TestCase):
     DATA = b'Jack is my hero'
 
     def test_binhex(self):
-        f = open(self.fname1, 'wb')
-        f.write(self.DATA)
-        f.close()
+        with open(self.fname1, 'wb') as f:
+            f.write(self.DATA)
 
         binhex.binhex(self.fname1, self.fname2)
 
         binhex.hexbin(self.fname2, self.fname1)
 
-        f = open(self.fname1, 'rb')
-        finish = f.readline()
-        f.close()
+        with open(self.fname1, 'rb') as f:
+            finish = f.readline()
 
         self.assertEqual(self.DATA, finish)
 

Lib/test/test_bool.py

@@ -20,13 +20,11 @@ class BoolTest(unittest.TestCase):
 
     def test_print(self):
         try:
-            fo = open(support.TESTFN, "w")
-            print(False, True, file=fo)
-            fo.close()
-            fo = open(support.TESTFN, "r")
-            self.assertEqual(fo.read(), 'False True\n')
+            with open(support.TESTFN, "w") as fo:
+                print(False, True, file=fo)
+            with open(support.TESTFN, "r") as fi:
+                self.assertEqual(fi.read(), 'False True\n')
         finally:
-            fo.close()
             os.remove(support.TESTFN)
 
     def test_repr(self):
@@ -245,9 +243,8 @@ class BoolTest(unittest.TestCase):
 
     def test_fileclosed(self):
         try:
-            f = open(support.TESTFN, "w")
-            self.assertIs(f.closed, False)
-            f.close()
+            with open(support.TESTFN, "w") as f:
+                self.assertIs(f.closed, False)
             self.assertIs(f.closed, True)
         finally:
             os.remove(support.TESTFN)

Lib/test/test_codecs.py

@@ -1242,9 +1242,8 @@ class EscapeDecodeTest(unittest.TestCase):
 class RecodingTest(unittest.TestCase):
     def test_recoding(self):
         f = io.BytesIO()
-        f2 = codecs.EncodedFile(f, "unicode_internal", "utf-8")
-        f2.write("a")
-        f2.close()
+        with codecs.EncodedFile(f, "unicode_internal", "utf-8") as f2:
+            f2.write("a")
         # Python used to crash on this at exit because of a refcount
         # bug in _codecsmodule.c
 

Lib/test/test_epoll.py

@@ -143,18 +143,17 @@ class TestEPoll(unittest.TestCase):
     def test_fromfd(self):
         server, client = self._connected_pair()
 
-        ep = select.epoll(2)
-        ep2 = select.epoll.fromfd(ep.fileno())
+        with select.epoll(2) as ep:
+            ep2 = select.epoll.fromfd(ep.fileno())
 
-        ep2.register(server.fileno(), select.EPOLLIN | select.EPOLLOUT)
-        ep2.register(client.fileno(), select.EPOLLIN | select.EPOLLOUT)
+            ep2.register(server.fileno(), select.EPOLLIN | select.EPOLLOUT)
+            ep2.register(client.fileno(), select.EPOLLIN | select.EPOLLOUT)
 
-        events = ep.poll(1, 4)
-        events2 = ep2.poll(0.9, 4)
-        self.assertEqual(len(events), 2)
-        self.assertEqual(len(events2), 2)
+            events = ep.poll(1, 4)
+            events2 = ep2.poll(0.9, 4)
+            self.assertEqual(len(events), 2)
+            self.assertEqual(len(events2), 2)
 
-        ep.close()
         try:
             ep2.poll(1, 4)
         except OSError as e:

Lib/test/test_float.py

@@ -722,15 +722,14 @@ class FormatTestCase(unittest.TestCase):
 
 class ReprTestCase(unittest.TestCase):
     def test_repr(self):
-        floats_file = open(os.path.join(os.path.split(__file__)[0],
-                           'floating_points.txt'))
-        for line in floats_file:
-            line = line.strip()
-            if not line or line.startswith('#'):
-                continue
-            v = eval(line)
-            self.assertEqual(v, eval(repr(v)))
-        floats_file.close()
+        with open(os.path.join(os.path.split(__file__)[0],
+                  'floating_points.txt')) as floats_file:
+            for line in floats_file:
+                line = line.strip()
+                if not line or line.startswith('#'):
+                    continue
+                v = eval(line)
+                self.assertEqual(v, eval(repr(v)))
 
     @unittest.skipUnless(getattr(sys, 'float_repr_style', '') == 'short',
                          "applies only when using short float repr style")

Lib/test/test_ioctl.py

@@ -11,9 +11,9 @@ try:
 except OSError:
     raise unittest.SkipTest("Unable to open /dev/tty")
 else:
-    # Skip if another process is in foreground
-    r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
-    tty.close()
+    with tty:
+        # Skip if another process is in foreground
+        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
     rpgrp = struct.unpack("i", r)[0]
     if rpgrp not in (os.getpgrp(), os.getsid(0)):
         raise unittest.SkipTest("Neither the process group nor the session "

Lib/test/test_os.py

@@ -1200,9 +1200,8 @@ class MakedirTests(unittest.TestCase):
     def test_exist_ok_existing_regular_file(self):
         base = support.TESTFN
         path = os.path.join(support.TESTFN, 'dir1')
-        f = open(path, 'w')
-        f.write('abc')
-        f.close()
+        with open(path, 'w') as f:
+            f.write('abc')
         self.assertRaises(OSError, os.makedirs, path)
         self.assertRaises(OSError, os.makedirs, path, exist_ok=False)
         self.assertRaises(OSError, os.makedirs, path, exist_ok=True)

Lib/test/test_pipes.py

@@ -23,9 +23,8 @@ class SimplePipeTests(unittest.TestCase):
             self.skipTest('tr is not available')
         t = pipes.Template()
         t.append(s_command, pipes.STDIN_STDOUT)
-        f = t.open(TESTFN, 'w')
-        f.write('hello world #1')
-        f.close()
+        with t.open(TESTFN, 'w') as f:
+            f.write('hello world #1')
         with open(TESTFN) as f:
             self.assertEqual(f.read(), 'HELLO WORLD #1')
 

Lib/test/test_poll.py

@@ -83,13 +83,12 @@ class PollTests(unittest.TestCase):
         r = p.poll()
         self.assertEqual(r[0], (FD, select.POLLNVAL))
 
-        f = open(TESTFN, 'w')
-        fd = f.fileno()
-        p = select.poll()
-        p.register(f)
-        r = p.poll()
-        self.assertEqual(r[0][0], fd)
-        f.close()
+        with open(TESTFN, 'w') as f:
+            fd = f.fileno()
+            p = select.poll()
+            p.register(f)
+            r = p.poll()
+            self.assertEqual(r[0][0], fd)
         r = p.poll()
         self.assertEqual(r[0], (fd, select.POLLNVAL))
         os.unlink(TESTFN)

Lib/test/test_random.py

@@ -268,9 +268,8 @@ class TestBasicOps:
                  ("randv2_64.pck", 866),
                  ("randv3.pck", 343)]
         for file, value in files:
-            f = open(support.findfile(file),"rb")
-            r = pickle.load(f)
-            f.close()
+            with open(support.findfile(file),"rb") as f:
+                r = pickle.load(f)
             self.assertEqual(int(r.random()*1000), value)
 
     def test_bug_9025(self):

Lib/test/test_runpy.py

@@ -238,9 +238,8 @@ class RunModuleTestCase(unittest.TestCase, CodeExecutionMixin):
                 if verbose > 1: print("  Next level in:", sub_dir)
                 if verbose > 1: print("  Created:", pkg_fname)
         mod_fname = os.path.join(sub_dir, test_fname)
-        mod_file = open(mod_fname, "w")
-        mod_file.write(source)
-        mod_file.close()
+        with open(mod_fname, "w") as mod_file:
+            mod_file.write(source)
         if verbose > 1: print("  Created:", mod_fname)
         mod_name = (pkg_name+".")*depth + mod_base
         mod_spec = importlib.util.spec_from_file_location(mod_name,

Lib/test/test_select.py

@@ -46,24 +46,23 @@ class SelectTestCase(unittest.TestCase):
 
     def test_select(self):
         cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
-        p = os.popen(cmd, 'r')
-        for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:
-            if support.verbose:
-                print('timeout =', tout)
-            rfd, wfd, xfd = select.select([p], [], [], tout)
-            if (rfd, wfd, xfd) == ([], [], []):
-                continue
-            if (rfd, wfd, xfd) == ([p], [], []):
-                line = p.readline()
+        with os.popen(cmd) as p:
+            for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:
                 if support.verbose:
-                    print(repr(line))
-                if not line:
+                    print('timeout =', tout)
+                rfd, wfd, xfd = select.select([p], [], [], tout)
+                if (rfd, wfd, xfd) == ([], [], []):
+                    continue
+                if (rfd, wfd, xfd) == ([p], [], []):
+                    line = p.readline()
                     if support.verbose:
-                        print('EOF')
-                    break
-                continue
-            self.fail('Unexpected return values from select():', rfd, wfd, xfd)
-        p.close()
+                        print(repr(line))
+                    if not line:
+                        if support.verbose:
+                            print('EOF')
+                        break
+                    continue
+                self.fail('Unexpected return values from select():', rfd, wfd, xfd)
 
     # Issue 16230: Crash on select resized list
     def test_select_mutated(self):

Lib/test/test_shelve.py

@@ -88,15 +88,13 @@ class TestCase(unittest.TestCase):
 
     def test_in_memory_shelf(self):
         d1 = byteskeydict()
-        s = shelve.Shelf(d1, protocol=0)
-        s['key1'] = (1,2,3,4)
-        self.assertEqual(s['key1'], (1,2,3,4))
-        s.close()
+        with shelve.Shelf(d1, protocol=0) as s:
+            s['key1'] = (1,2,3,4)
+            self.assertEqual(s['key1'], (1,2,3,4))
         d2 = byteskeydict()
-        s = shelve.Shelf(d2, protocol=1)
-        s['key1'] = (1,2,3,4)
-        self.assertEqual(s['key1'], (1,2,3,4))
-        s.close()
+        with shelve.Shelf(d2, protocol=1) as s:
+            s['key1'] = (1,2,3,4)
+            self.assertEqual(s['key1'], (1,2,3,4))
 
         self.assertEqual(len(d1), 1)
         self.assertEqual(len(d2), 1)
@@ -104,20 +102,18 @@ class TestCase(unittest.TestCase):
 
     def test_mutable_entry(self):
         d1 = byteskeydict()
-        s = shelve.Shelf(d1, protocol=2, writeback=False)
-        s['key1'] = [1,2,3,4]
-        self.assertEqual(s['key1'], [1,2,3,4])
-        s['key1'].append(5)
-        self.assertEqual(s['key1'], [1,2,3,4])
-        s.close()
+        with shelve.Shelf(d1, protocol=2, writeback=False) as s:
+            s['key1'] = [1,2,3,4]
+            self.assertEqual(s['key1'], [1,2,3,4])
+            s['key1'].append(5)
+            self.assertEqual(s['key1'], [1,2,3,4])
 
         d2 = byteskeydict()
-        s = shelve.Shelf(d2, protocol=2, writeback=True)
-        s['key1'] = [1,2,3,4]
-        self.assertEqual(s['key1'], [1,2,3,4])
-        s['key1'].append(5)
-        self.assertEqual(s['key1'], [1,2,3,4,5])
-        s.close()
+        with shelve.Shelf(d2, protocol=2, writeback=True) as s:
+            s['key1'] = [1,2,3,4]
+            self.assertEqual(s['key1'], [1,2,3,4])
+            s['key1'].append(5)
+            self.assertEqual(s['key1'], [1,2,3,4,5])
 
         self.assertEqual(len(d1), 1)
         self.assertEqual(len(d2), 1)
@@ -140,11 +136,10 @@ class TestCase(unittest.TestCase):
         d = {}
         key = 'key'
         encodedkey = key.encode('utf-8')
-        s = shelve.Shelf(d, writeback=True)
-        s[key] = [1]
-        p1 = d[encodedkey]  # Will give a KeyError if backing store not updated
-        s['key'].append(2)
-        s.close()
+        with shelve.Shelf(d, writeback=True) as s:
+            s[key] = [1]
+            p1 = d[encodedkey]  # Will give a KeyError if backing store not updated
+            s['key'].append(2)
         p2 = d[encodedkey]
         self.assertNotEqual(p1, p2)  # Write creates new object in store
 

Lib/test/test_site.py

@@ -125,10 +125,9 @@ class HelperFunctionsTests(unittest.TestCase):
         pth_dir = os.path.abspath(pth_dir)
         pth_basename = pth_name + '.pth'
         pth_fn = os.path.join(pth_dir, pth_basename)
-        pth_file = open(pth_fn, 'w', encoding='utf-8')
-        self.addCleanup(lambda: os.remove(pth_fn))
-        pth_file.write(contents)
-        pth_file.close()
+        with open(pth_fn, 'w', encoding='utf-8') as pth_file:
+            self.addCleanup(lambda: os.remove(pth_fn))
+            pth_file.write(contents)
         return pth_dir, pth_basename
 
     def test_addpackage_import_bad_syntax(self):

Lib/test/test_socketserver.py

@@ -157,27 +157,25 @@ class SocketServerTest(unittest.TestCase):
         if verbose: print("done")
 
     def stream_examine(self, proto, addr):
-        s = socket.socket(proto, socket.SOCK_STREAM)
-        s.connect(addr)
-        s.sendall(TEST_STR)
-        buf = data = receive(s, 100)
-        while data and b'\n' not in buf:
-            data = receive(s, 100)
-            buf += data
-        self.assertEqual(buf, TEST_STR)
-        s.close()
+        with socket.socket(proto, socket.SOCK_STREAM) as s:
+            s.connect(addr)
+            s.sendall(TEST_STR)
+            buf = data = receive(s, 100)
+            while data and b'\n' not in buf:
+                data = receive(s, 100)
+                buf += data
+            self.assertEqual(buf, TEST_STR)
 
     def dgram_examine(self, proto, addr):
-        s = socket.socket(proto, socket.SOCK_DGRAM)
-        if HAVE_UNIX_SOCKETS and proto == socket.AF_UNIX:
-            s.bind(self.pickaddr(proto))
-        s.sendto(TEST_STR, addr)
-        buf = data = receive(s, 100)
-        while data and b'\n' not in buf:
-            data = receive(s, 100)
-            buf += data
-        self.assertEqual(buf, TEST_STR)
-        s.close()
+        with socket.socket(proto, socket.SOCK_DGRAM) as s:
+            if HAVE_UNIX_SOCKETS and proto == socket.AF_UNIX:
+                s.bind(self.pickaddr(proto))
+            s.sendto(TEST_STR, addr)
+            buf = data = receive(s, 100)
+            while data and b'\n' not in buf:
+                data = receive(s, 100)
+                buf += data
+            self.assertEqual(buf, TEST_STR)
 
     def test_TCPServer(self):
         self.run_server(socketserver.TCPServer,

Lib/test/test_tempfile.py

@@ -573,9 +573,8 @@ class TestGetTempDir(BaseTestCase):
         # sneaky: just instantiate a NamedTemporaryFile, which
         # defaults to writing into the directory returned by
         # gettempdir.
-        file = tempfile.NamedTemporaryFile()
-        file.write(b"blat")
-        file.close()
+        with tempfile.NamedTemporaryFile() as file:
+            file.write(b"blat")
 
     def test_same_thing(self):
         # gettempdir always returns the same object
@@ -891,9 +890,8 @@ class TestNamedTemporaryFile(BaseTestCase):
         # A NamedTemporaryFile is deleted when closed
         dir = tempfile.mkdtemp()
         try:
-            f = tempfile.NamedTemporaryFile(dir=dir)
-            f.write(b'blat')
-            f.close()
+            with tempfile.NamedTemporaryFile(dir=dir) as f:
+                f.write(b'blat')
             self.assertFalse(os.path.exists(f.name),
                         "NamedTemporaryFile %s exists after close" % f.name)
         finally:

Lib/test/test_threading.py

@@ -788,13 +788,11 @@ class ThreadJoinOnShutdown(BaseTestCase):
             def random_io():
                 '''Loop for a while sleeping random tiny amounts and doing some I/O.'''
                 while True:
-                    in_f = open(os.__file__, 'rb')
-                    stuff = in_f.read(200)
-                    null_f = open(os.devnull, 'wb')
-                    null_f.write(stuff)
-                    time.sleep(random.random() / 1995)
-                    null_f.close()
-                    in_f.close()
+                    with open(os.__file__, 'rb') as in_f:
+                        stuff = in_f.read(200)
+                        with open(os.devnull, 'wb') as null_f:
+                            null_f.write(stuff)
+                            time.sleep(random.random() / 1995)
                     thread_has_run.add(threading.current_thread())
 
             def main():

Lib/test/test_urllib2.py

@@ -57,10 +57,8 @@ class TrivialTests(unittest.TestCase):
         else:
             file_url = "file://%s" % fname
 
-        f = urllib.request.urlopen(file_url)
-
-        f.read()
-        f.close()
+        with urllib.request.urlopen(file_url) as f:
+            f.read()
 
     def test_parse_http_list(self):
         tests = [

Lib/test/test_urllib2_localnet.py

@@ -371,10 +371,9 @@ class ProxyAuthTests(unittest.TestCase):
         self.proxy_digest_handler.add_password(self.REALM, self.URL,
                                                self.USER, self.PASSWD)
         self.digest_auth_handler.set_qop("auth")
-        result = self.opener.open(self.URL)
-        while result.read():
-            pass
-        result.close()
+        with self.opener.open(self.URL) as result:
+            while result.read():
+                pass
 
     def test_proxy_qop_auth_int_works_or_throws_urlerror(self):
         self.proxy_digest_handler.add_password(self.REALM, self.URL,
@@ -386,11 +385,11 @@ class ProxyAuthTests(unittest.TestCase):
             # It's okay if we don't support auth-int, but we certainly
             # shouldn't receive any kind of exception here other than
             # a URLError.
-            result = None
-        if result:
-            while result.read():
-                pass
-            result.close()
+            pass
+        else:
+            with result:
+                while result.read():
+                    pass
 
 
 def GetRequestHandler(responses):
@@ -611,14 +610,11 @@ class TestUrlopen(unittest.TestCase):
 
     def test_basic(self):
         handler = self.start_server()
-        open_url = urllib.request.urlopen("http://localhost:%s" % handler.port)
-        for attr in ("read", "close", "info", "geturl"):
-            self.assertTrue(hasattr(open_url, attr), "object returned from "
-                         "urlopen lacks the %s attribute" % attr)
-        try:
+        with urllib.request.urlopen("http://localhost:%s" % handler.port) as open_url:
+            for attr in ("read", "close", "info", "geturl"):
+                self.assertTrue(hasattr(open_url, attr), "object returned from "
+                             "urlopen lacks the %s attribute" % attr)
             self.assertTrue(open_url.read(), "calling 'read' failed")
-        finally:
-            open_url.close()
 
     def test_info(self):
         handler = self.start_server()

Lib/test/test_xmlrpc.py

@@ -821,10 +821,9 @@ class SimpleServerTestCase(BaseServerTestCase):
     def test_404(self):
         # send POST with http.client, it should return 404 header and
         # 'Not Found' message.
-        conn = http.client.HTTPConnection(ADDR, PORT)
-        conn.request('POST', '/this-is-not-valid')
-        response = conn.getresponse()
-        conn.close()
+        with contextlib.closing(http.client.HTTPConnection(ADDR, PORT)) as conn:
+            conn.request('POST', '/this-is-not-valid')
+            response = conn.getresponse()
 
         self.assertEqual(response.status, 404)
         self.assertEqual(response.reason, 'Not Found')
@@ -944,9 +943,8 @@ class SimpleServerTestCase(BaseServerTestCase):
 
     def test_partial_post(self):
         # Check that a partial POST doesn't make the server loop: issue #14001.
-        conn = http.client.HTTPConnection(ADDR, PORT)
-        conn.request('POST', '/RPC2 HTTP/1.0\r\nContent-Length: 100\r\n\r\nbye')
-        conn.close()
+        with contextlib.closing(http.client.HTTPConnection(ADDR, PORT)) as conn:
+            conn.request('POST', '/RPC2 HTTP/1.0\r\nContent-Length: 100\r\n\r\nbye')
 
     def test_context_manager(self):
         with xmlrpclib.ServerProxy(URL) as server:

Lib/test/test_zipimport_support.py

@@ -122,15 +122,13 @@ class ZipSupportTests(unittest.TestCase):
                                             test_src)
             zip_name, run_name = make_zip_script(d, 'test_zip',
                                                 script_name)
-            z = zipfile.ZipFile(zip_name, 'a')
-            for mod_name, src in sample_sources.items():
-                z.writestr(mod_name + ".py", src)
-            z.close()
+            with zipfile.ZipFile(zip_name, 'a') as z:
+                for mod_name, src in sample_sources.items():
+                    z.writestr(mod_name + ".py", src)
             if verbose:
-                zip_file = zipfile.ZipFile(zip_name, 'r')
-                print ('Contents of %r:' % zip_name)
-                zip_file.printdir()
-                zip_file.close()
+                with zipfile.ZipFile(zip_name, 'r') as zip_file:
+                    print ('Contents of %r:' % zip_name)
+                    zip_file.printdir()
             os.remove(script_name)
             sys.path.insert(0, zip_name)
             import test_zipped_doctest