Fix pylint errors in our tests.

CHANGES.rst

@@ -42,6 +42,10 @@
   Objects/tupleobject.c: bad argument to internal function``. Reported
   in :issue:`1302` by Ulrich Petri.
 
+- Refactored the gevent test runner and test suite to make them more
+  reusable. In particular, the tests are now run with ``python -m
+  gevent.tests``. See :issue:`1293`.
+
 1.3.7 (2018-10-12)
 ==================
 

doc/install.rst

@@ -177,8 +177,7 @@ tests on one version of Python during development, begin with the
 above instructions to install gevent in a virtual environment and then
 run::
 
-  (env) $ cd src/greentest
-  (env) $ python ./testrunner.py
+  (env) $ python -mgevent.tests
 
 Before submitting a pull request, it's a good idea to run the tests
 across all supported versions of Python, and to check the code quality
@@ -192,8 +191,7 @@ The testrunner accepts a ``--coverage`` argument to enable code
 coverage metrics through the `coverage.py`_ package. That would go
 something like this::
 
-  cd src/greentest
-  python testrunner.py --coverage
+  python -m gevent.tests --coverage
   coverage combine
   coverage html -i
   <open htmlcov/index.html>

src/gevent/tests/lock_tests.py

 """
 Various tests for synchronization primitives.
 """
+# pylint:disable=no-member,abstract-method
 import sys
 import time
 try:
@@ -131,7 +132,7 @@ class BaseLockTests(BaseTestCase):
         def _with(err=None):
             with lock:
                 if err is not None:
-                    raise err
+                    raise err # pylint:disable=raising-bad-type
         _with()
         # Check the lock is unacquired
         Bunch(f, 1).wait_for_finished()
@@ -153,7 +154,7 @@ class BaseLockTests(BaseTestCase):
         self.assertEqual(n, len(threading.enumerate()))
 
 
-class LockTests(BaseLockTests):
+class LockTests(BaseLockTests): # pylint:disable=abstract-method
     """
     Tests for non-recursive, weak locks
     (which can be acquired and released from different threads).
@@ -168,7 +169,7 @@ class LockTests(BaseLockTests):
             lock.acquire()
             phase.append(None)
         start_new_thread(f, ())
-        while len(phase) == 0:
+        while not phase:
             _wait()
         _wait()
         self.assertEqual(len(phase), 1)
@@ -436,9 +437,10 @@ class BaseSemaphoreTests(BaseTestCase):
         raise NotImplementedError()
 
     def test_constructor(self):
-        self.assertRaises(ValueError, self.semtype, value = -1)
+        self.assertRaises(ValueError, self.semtype, value=-1)
         # Py3 doesn't have sys.maxint
-        self.assertRaises(ValueError, self.semtype, value = -getattr(sys, 'maxint', getattr(sys, 'maxsize', None)))
+        self.assertRaises(ValueError, self.semtype,
+                          value=-getattr(sys, 'maxint', getattr(sys, 'maxsize', None)))
 
     def test_acquire(self):
         sem = self.semtype(1)
@@ -509,7 +511,7 @@ class BaseSemaphoreTests(BaseTestCase):
         # There can be a thread switch between acquiring the semaphore and
         # appending the result, therefore results will not necessarily be
         # ordered.
-        self.assertEqual(sorted(results), [False] * 7 + [True] *  3 )
+        self.assertEqual(sorted(results), [False] * 7 + [True] *  3)
 
     def test_default_value(self):
         # The default initial value is 1.
@@ -534,7 +536,7 @@ class BaseSemaphoreTests(BaseTestCase):
                 with sem:
                     self.assertFalse(sem.acquire(False))
                     if err:
-                        raise err
+                        raise err # pylint:disable=raising-bad-type
         _with()
         self.assertTrue(sem.acquire(False))
         sem.release()
@@ -603,7 +605,7 @@ class BarrierTests(BaseTestCase):
         """
         Test that a barrier is passed in lockstep
         """
-        results = [[],[]]
+        results = [[], []]
         def f():
             self.multipass(results, passes)
         self.run_threads(f)
@@ -657,7 +659,6 @@ class BarrierTests(BaseTestCase):
                 results2.append(True)
             except RuntimeError:
                 self.barrier.abort()
-                pass
 
         self.run_threads(f)
         self.assertEqual(len(results1), 0)
@@ -713,7 +714,7 @@ class BarrierTests(BaseTestCase):
                 results2.append(True)
             except RuntimeError:
                 self.barrier.abort()
-                pass
+
             # Synchronize and reset the barrier.  Must synchronize first so
             # that everyone has left it when we reset, and after so that no
             # one enters it before the reset.

src/gevent/tests/test__all__.py

@@ -133,7 +133,7 @@ class Test(unittest.TestCase):
             if hasattr(self.stdlib_module, name):
                 raise AssertionError("'%r' is not an extension, it is found in %r" % (name, self.stdlib_module))
 
-    def check_completeness(self):
+    def check_completeness(self): # pylint:disable=too-many-branches
         """Check that __all__ (or dir()) of the corresponsing stdlib is a subset of __all__ of this module"""
         missed = []
         for name in self.stdlib_all:

src/gevent/tests/test__api.py

@@ -36,10 +36,10 @@ class Test(greentest.TestCase):
             try:
                 state.append('start')
                 gevent.sleep(DELAY * 3.0)
-            except:
+            except: # pylint:disable=bare-except
                 state.append('except')
                 # catching GreenletExit
-                pass
+
             state.append('finished')
 
         g = gevent.spawn(test)
@@ -68,7 +68,9 @@ class Test(greentest.TestCase):
         def _test_wait_read_invalid_switch(self, sleep):
             sock1, sock2 = socket.socketpair()
             try:
-                p = gevent.spawn(util.wrap_errors(AssertionError, socket.wait_read), sock1.fileno())
+                p = gevent.spawn(util.wrap_errors(AssertionError,
+                                                  socket.wait_read), # pylint:disable=no-member
+                                 sock1.fileno())
                 gevent.get_hub().loop.run_callback(switch_None, p)
                 if sleep is not None:
                     gevent.sleep(sleep)

src/gevent/tests/test__core_fork.py

 from __future__ import print_function
-import gevent.monkey; gevent.monkey.patch_all()
+import gevent.monkey
+gevent.monkey.patch_all()
 import gevent
 import os
 

src/gevent/tests/test__core_loop_run_sig_mod.py

@@ -6,11 +6,11 @@ import test__core_loop_run # this runs main tests, fails if signal() is not call
 assert test__core_loop_run # pyflakes
 
 from gevent.hub import signal as hub_signal
-from gevent import signal
+from gevent import signal as top_signal # pylint:disable=reimported
 
 assert gevent.signal is hub_signal
-assert gevent.signal is signal
+assert gevent.signal is top_signal
 assert hasattr(gevent.signal, 'signal')
-s = signal(2, sys.stderr.write, 'INTERRUPT')
-assert isinstance(s, signal)
+s = top_signal(2, sys.stderr.write, 'INTERRUPT')
+assert isinstance(s, top_signal)
 assert isinstance(s, hub_signal)

src/gevent/tests/test__core_timer.py

@@ -94,7 +94,7 @@ class TestTimerResolution(Test):
     # On CI, with *all* backends, sometimes we get timer values of
     # 0.02 or higher.
     @reraises_flaky_timeout(AssertionError)
-    def test_resolution(self):
+    def test_resolution(self): # pylint:disable=too-many-locals
         # Make sure that having an active IO watcher
         # doesn't badly throw off our timer resolution.
         # (This was a specific problem with libuv)

src/gevent/tests/test__execmodules.py

@@ -14,7 +14,7 @@ class TestExec(unittest.TestCase):
 
 def make_exec_test(path, module):
 
-    def test(self):
+    def test(_):
         #sys.stderr.write('%s %s\n' % (module, path))
         with open(path, 'rb') as f:
             src = f.read()
@@ -24,8 +24,8 @@ def make_exec_test(path, module):
     test.__name__ = name
     setattr(TestExec, name, test)
 
-
-for path, module in walk_modules():
+def make_all_tests():
+    for path, module in walk_modules():
         ignored = False
         for x in NON_APPLICABLE_SUFFIXES:
             if module.endswith(x):
@@ -37,5 +37,7 @@ for path, module in walk_modules():
         make_exec_test(path, module)
 
 
+make_all_tests()
+
 if __name__ == '__main__':
     main()

src/gevent/tests/test__greenletset.py

@@ -142,7 +142,7 @@ class Test(greentest.TestCase):
         def f():
             try:
                 gevent.sleep(1.5)
-            except:
+            except: # pylint:disable=bare-except
                 gevent.sleep(1)
         p1 = GreenletSubclass.spawn(f)
         p2 = GreenletSubclass.spawn(f)

src/gevent/tests/test__issue467.py

@@ -23,7 +23,7 @@ def main():
 
     workers = [gevent.spawn(worker, i) for i in range(3)]
     workers.append(done_worker)
-    for g in gevent.iwait(workers):
+    for _ in gevent.iwait(workers):
         finished += 1
         # Simulate doing something that causes greenlets to switch;
         # a non-zero timeout is crucial

src/gevent/tests/test__local.py

@@ -160,7 +160,7 @@ class TestGeventLocal(greentest.TestCase):
         self.assertEqual(a.initialized, 2)
 
         # The slot overrides dict values
-        a.__dict__['initialized'] = 42
+        a.__dict__['initialized'] = 42 # pylint:disable=unsupported-assignment-operation
         self.assertEqual(a.initialized, 2)
 
         # Deleting the slot deletes the slot, but not the dict

src/gevent/tests/test__memleak.py

 import sys
-
+import unittest
 
 from gevent.testing import TestCase, main
 import gevent
 from gevent.timeout import Timeout
 
-
+@unittest.skipUnless(
+    hasattr(sys, 'gettotalrefcount'),
+    "Needs debug build"
+)
 class TestQueue(TestCase):
+    # pylint:disable=bare-except,no-member
 
     def test(self):
         result = ''
@@ -43,12 +47,10 @@ class TestQueue(TestCase):
 
         result += '%s' % sys.gettotalrefcount()
 
-        a, b, c = result.split()
+        _, b, c = result.split()
         assert b == c, 'total refcount mismatch: %s' % result
 
 
-if not hasattr(sys, 'gettotalrefcount'):
-    del TestQueue
 
 if __name__ == '__main__':
     main()

src/gevent/tests/test__monkey_logging.py

@@ -16,7 +16,7 @@ def _inner_lock(lock):
 
 def checkLocks(kind, ignore_none=True):
     handlers = logging._handlerList
-    assert len(handlers) > 0
+    assert handlers
 
     for weakref in handlers:
         # In py26, these are actual handlers, not weakrefs

src/gevent/tests/test__monkey_sigchld.py

@@ -11,7 +11,7 @@ pid = None
 awaiting_child = []
 
 
-def handle_sigchld(*args):
+def handle_sigchld(*_args):
     # Make sure we can do a blocking operation
     gevent.sleep()
     # Signal completion

src/gevent/tests/test__monkey_sigchld_3.py

@@ -16,12 +16,12 @@ import sys
 import signal
 import subprocess
 
-def _waitpid(pid):
+def _waitpid(p):
     try:
-        _, stat = os.waitpid(pid, 0)
+        _, stat = os.waitpid(p, 0)
     except OSError:
         # Interrupted system call
-        _, stat = os.waitpid(pid, 0)
+        _, stat = os.waitpid(p, 0)
     assert stat == 0, stat
 
 if hasattr(signal, 'SIGCHLD'):

src/gevent/tests/test__pool.py

@@ -78,7 +78,7 @@ class TestCoroutinePool(unittest.TestCase):
             timer_fired.append(True)
 
         def some_work():
-            gevent.timer(0, fire_timer)
+            gevent.timer(0, fire_timer) # pylint:disable=no-member
 
         pool = self.klass(2)
         pool.apply(some_work)

src/gevent/tests/test__pywsgi.py

@@ -611,10 +611,12 @@ class TestChunkedPost(TestCase):
         if env['PATH_INFO'] == '/a':
             data = env['wsgi.input'].read(6)
             return [data]
-        elif env['PATH_INFO'] == '/b':
+
+        if env['PATH_INFO'] == '/b':
             lines = [x for x in iter(lambda: env['wsgi.input'].read(6), b'')]
             return lines
-        elif env['PATH_INFO'] == '/c':
+
+        if env['PATH_INFO'] == '/c':
             return [x for x in iter(lambda: env['wsgi.input'].read(1), b'')]
 
     def test_014_chunked_post(self):

src/gevent/tests/test__refcount.py

@@ -23,7 +23,7 @@
 are not leaked by the hub.
 """
 from __future__ import print_function
-from _socket import socket
+from _socket import socket as c_socket
 import sys
 if sys.version_info[0] >= 3:
     # Python3 enforces that __weakref__ appears only once,
@@ -32,9 +32,9 @@ if sys.version_info[0] >= 3:
     # (because socket.socket defines __slots__ with __weakref__),
     # so import socket.socket before that can happen.
     __import__('socket')
-    Socket = socket
+    Socket = c_socket
 else:
-    class Socket(socket):
+    class Socket(c_socket):
         "Something we can have a weakref to"
 
 import _socket
@@ -117,7 +117,7 @@ def run_interaction(run_client):
         # strong refs to the socket still around.
         try:
             sleep(0.1 + SOCKET_TIMEOUT)
-        except Exception:
+        except Exception: # pylint:disable=broad-except
             pass
 
     return w
@@ -139,7 +139,8 @@ def run_and_check(run_client):
 
 
 @greentest.skipOnCI("Often fail with timeouts or force closed connections; not sure why.")
-@greentest.skipIf(greentest.RUN_LEAKCHECKS and greentest.PY3,
+@greentest.skipIf(
+    greentest.RUN_LEAKCHECKS and greentest.PY3,
     "Often fail with force closed connections; not sure why. "
 )
 class Test(greentest.TestCase):

src/gevent/tests/test__server.py

@@ -14,7 +14,7 @@ from gevent.server import StreamServer
 
 class SimpleStreamServer(StreamServer):
 
-    def handle(self, client_socket, _address):
+    def handle(self, client_socket, _address): # pylint:disable=method-hidden
         fd = client_socket.makefile()
         try:
             request_line = fd.readline()
@@ -487,7 +487,7 @@ class TestSSLGetCertificate(TestCase):
         self.init_server()
 
         server_host, server_port, _family = self.get_server_host_port_family()
-        ssl.get_server_certificate((server_host, server_port))
+        ssl.get_server_certificate((server_host, server_port)) # pylint:disable=no-member
 
 
     def test_wrap_socket_and_handle_wrap_failure(self):

src/gevent/tests/test__signal.py

@@ -6,7 +6,7 @@ import pkg_resources
 
 try:
     cffi_version = pkg_resources.get_distribution('cffi').parsed_version
-except Exception:
+except Exception: # pylint:disable=broad-except
     # No cffi installed. Shouldn't happen to gevent standard tests,
     # but maybe some downstream distributor removed it.
     cffi_version = None
@@ -50,7 +50,7 @@ if hasattr(signal, 'SIGALRM'):
                 except Expected as ex:
                     assert str(ex) == 'TestSignal', ex
             finally:
-                sig.cancel()
+                sig.cancel() # pylint:disable=no-member
 
 
         @greentest.skipIf((greentest.PY3

src/gevent/tests/test__socket.py

@@ -320,7 +320,7 @@ class TestTCP(greentest.TestCase):
         # Issue 944
         # If we have SOCK_CLOEXEC or similar, we shouldn't be passing
         # them through to the getaddrinfo call that connect() makes
-        SOCK_CLOEXEC = socket.SOCK_CLOEXEC
+        SOCK_CLOEXEC = socket.SOCK_CLOEXEC # pylint:disable=no-member
         s = socket.socket(socket.AF_INET, socket.SOCK_STREAM | SOCK_CLOEXEC)
 
         def accept_once():
@@ -421,7 +421,7 @@ class TestFunctions(greentest.TestCase):
                 gevent.sleep(10)
 
         with self.assertRaises(gevent.socket.timeout):
-            gevent.socket.wait(io(), timeout=0.01)
+            gevent.socket.wait(io(), timeout=0.01) # pylint:disable=no-member
 
 
     def test_signatures(self):

src/gevent/tests/test__socket_dns.py

 #!/usr/bin/python
 # -*- coding: utf-8 -*-
-
+# pylint:disable=broad-except
 import gevent
 from gevent import monkey
 
@@ -83,9 +83,9 @@ def run(function, *args):
     return result, delta
 
 
-def log_call(result, time, function, *args):
+def log_call(result, runtime, function, *args):
     log(format_call(function, args))
-    log_fresult(result, time)
+    log_fresult(result, runtime)
 
 
 def compare_relaxed(a, b):
@@ -332,9 +332,11 @@ class TestCase(greentest.TestCase):
         # If we're using the ares resolver, allow the real resolver to generate an
         # error that the ares resolver actually gets an answer to.
 
-        if (RESOLVER_NOT_SYSTEM
+        if (
+                RESOLVER_NOT_SYSTEM
                 and isinstance(real_result, errors)
-            and not isinstance(gevent_result, errors)):
+                and not isinstance(gevent_result, errors)
+        ):
             return
 
         # From 2.7 on, assertEqual does a better job highlighting the results than we would
@@ -453,7 +455,7 @@ class SanitizedHostsFile(HostsFile):
 # the system's etc hosts?
 class TestEtcHosts(TestCase):
 
-    MAX_HOSTS = os.getenv('GEVENTTEST_MAX_ETC_HOSTS', 10)
+    MAX_HOSTS = int(os.getenv('GEVENTTEST_MAX_ETC_HOSTS', '10'))
 
     @classmethod
     def populate_tests(cls):
@@ -493,7 +495,7 @@ class TestFamily(TestCase):
             cls._result = getattr(socket, 'getaddrinfo')(TestGeventOrg.HOSTNAME, None)
         return cls._result
 
-    def assert_error(self, error, function, *args):
+    def assert_error(self, error, function, *args): # pylint:disable=arguments-differ
         try:
             result = function(*args)
             raise AssertionError('%s: Expected to raise %s, instead returned %r' % (function, error, result))

src/gevent/tests/test__socket_ssl.py

 #!/usr/bin/python
-from gevent import monkey; monkey.patch_all()
-import sys
-import gevent.testing as greentest
+from gevent import monkey
+monkey.patch_all()
+
+import unittest
 try:
     import httplib
 except ImportError:
     from http import client as httplib
 import socket
 
-if not hasattr(socket, 'ssl'):
-    sys.exit(0)
+
+import gevent.testing as greentest
 
 
+@unittest.skipUnless(
+    hasattr(socket, 'ssl'),
+    "Needs socket.ssl"
+)
 class AmazonHTTPSTests(greentest.TestCase):
 
     __timeout__ = 30
@@ -25,7 +30,7 @@ class AmazonHTTPSTests(greentest.TestCase):
     def test_str_and_repr(self):
         conn = socket.socket()
         conn.connect(('sdb.amazonaws.com', 443))
-        ssl_conn = socket.ssl(conn)
+        ssl_conn = socket.ssl(conn) # pylint:disable=no-member
         assert str(ssl_conn)
         assert repr(ssl_conn)
 

src/gevent/tests/test__ssl.py

@@ -28,7 +28,7 @@ class TestSSL(test__socket.TestTCP):
         self._close_on_teardown(raw_listener)
         return listener
 
-    def create_connection(self, *args, **kwargs):
+    def create_connection(self, *args, **kwargs): # pylint:disable=arguments-differ
         return ssl.wrap_socket(super(TestSSL, self).create_connection(*args, **kwargs))
 
     # The SSL library can take a long time to buffer the large amount of data we're trying

src/gevent/tests/test__subprocess.py

@@ -222,7 +222,7 @@ class Test(greentest.TestCase):
     def test_check_output_keyword_error(self):
         try:
             subprocess.check_output([sys.executable, '-c', 'import sys; sys.exit(44)'])
-        except subprocess.CalledProcessError as e:
+        except subprocess.CalledProcessError as e: # pylint:disable=no-member
             self.assertEqual(e.returncode, 44)
         else:
             raise AssertionError('must fail with CalledProcessError')
@@ -282,7 +282,6 @@ class Test(greentest.TestCase):
         # If the file is in universal_newlines mode, we should always get a str when
         # there is no output.
         # https://github.com/gevent/gevent/pull/939
-        kwargs = {'universal_newlines': True}
         self.__test_no_output({'universal_newlines': True}, str)
 
     @greentest.skipIf(sys.version_info[:2] < (3, 6), "Need encoding argument")
@@ -397,11 +396,11 @@ class RunFuncTestCase(greentest.TestCase):
         # call() function with sequence argument
         cp = self.run_python("import sys; sys.exit(47)")
         self.assertEqual(cp.returncode, 47)
-        with self.assertRaises(subprocess.CalledProcessError):
+        with self.assertRaises(subprocess.CalledProcessError): # pylint:disable=no-member
             cp.check_returncode()
 
     def test_check(self):
-        with self.assertRaises(subprocess.CalledProcessError) as c:
+        with self.assertRaises(subprocess.CalledProcessError) as c: # pylint:disable=no-member
             self.run_python("import sys; sys.exit(47)", check=True)
         self.assertEqual(c.exception.returncode, 47)
 

src/gevent/tests/test__threading_monkey_in_thread.py

@@ -35,7 +35,7 @@ class Test(greentest.TestCase):
         thread.start()
         try:
             thread.join()
-        except:
+        except: # pylint:disable=bare-except
             # XXX: This can raise LoopExit in some cases.
             greentest.reraiseFlakyTestRaceCondition()
 

src/gevent/tests/test__threading_patched_local.py

 from gevent import monkey; monkey.patch_all()
 import threading
 
+
 localdata = threading.local()
 localdata.x = "hello"
 assert localdata.x == 'hello'
@@ -9,7 +10,7 @@ success = []
 
 def func():
     try:
-        localdata.x
+        getattr(localdata, 'x')
         raise AssertionError('localdata.x must raise AttributeError')
     except AttributeError:
         pass

src/gevent/tests/test__timeout.py

@@ -89,7 +89,7 @@ class Test(greentest.TestCase):
         except TypeError as ex:
             self.assertTrue(greentest.PY3, "Py3 raises a TypeError for non-BaseExceptions")
             self.assert_type_err(ex)
-        except:
+        except: # pylint:disable=bare-except
             self.assertTrue(greentest.PY2, "Old style classes can only be raised on Py2")
             t = sys.exc_info()[0]
             self.assertEqual(t, OldStyle)
@@ -103,7 +103,7 @@ class Test(greentest.TestCase):
         except TypeError as ex:
             self.assertTrue(greentest.PY3, "Py3 raises a TypeError for non-BaseExceptions")
             self.assert_type_err(ex)
-        except:
+        except: # pylint:disable=bare-except
             self.assertTrue(greentest.PY2, "Old style classes can only be raised on Py2")
             t = sys.exc_info()[0]
             self.assertEqual(t, OldStyle)

src/gevent/tests/test_threading_2.py

@@ -231,6 +231,9 @@ class ThreadTests(unittest.TestCase):
         worker_saw_exception = threading.Event()
 
         class Worker(threading.Thread):
+            id = None
+            finished = False
+
             def run(self):
                 self.id = thread.get_ident()
                 self.finished = False
@@ -278,7 +281,7 @@ class ThreadTests(unittest.TestCase):
 
     def test_limbo_cleanup(self):
         # Issue 7481: Failure to start thread should cleanup the limbo map.
-        def fail_new_thread(*args):
+        def fail_new_thread(*_args):
             raise thread.error()
         _start_new_thread = threading._start_new_thread
         threading._start_new_thread = fail_new_thread
@@ -406,7 +409,7 @@ class ThreadTests(unittest.TestCase):
                                                    kwargs={'yet_another': self})
                     self.thread.start()
 
-                def _run(self, other_ref, yet_another):
+                def _run(self, _other_ref, _yet_another):
                     if self.should_raise:
                         raise SystemExit
 
@@ -542,23 +545,24 @@ class ThreadJoinOnShutdown(unittest.TestCase):
 class ThreadingExceptionTests(unittest.TestCase):
     # A RuntimeError should be raised if Thread.start() is called
     # multiple times.
+    # pylint:disable=bad-thread-instantiation
     def test_start_thread_again(self):
-        thread = threading.Thread()
-        thread.start()
-        self.assertRaises(RuntimeError, thread.start)
+        thread_ = threading.Thread()
+        thread_.start()
+        self.assertRaises(RuntimeError, thread_.start)
 
     def test_joining_current_thread(self):
         current_thread = threading.current_thread()
         self.assertRaises(RuntimeError, current_thread.join)
 
     def test_joining_inactive_thread(self):
-        thread = threading.Thread()
-        self.assertRaises(RuntimeError, thread.join)
+        thread_ = threading.Thread()
+        self.assertRaises(RuntimeError, thread_.join)
 
     def test_daemonize_active_thread(self):
-        thread = threading.Thread()
-        thread.start()
-        self.assertRaises(RuntimeError, setattr, thread, "daemon", True)
+        thread_ = threading.Thread()
+        thread_.start()
+        self.assertRaises(RuntimeError, setattr, thread_, "daemon", True)
 
 
 class LockTests(lock_tests.LockTests):