issue3352: clean up the multiprocessing API to remove many get_/set_ methods and convert them to properties. Update the docs and the examples included.

Doc/includes/mp_distributing.py

@@ -152,7 +152,7 @@ def _help_stuff_finish(inqueue, task_handler, size):
 
 def LocalProcess(**kwds):
     p = Process(**kwds)
-    p.set_name('localhost/' + p.get_name())
+    p.set_name('localhost/' + p.name)
     return p
 
 class Cluster(managers.SyncManager):

Doc/includes/mp_pool.py

@@ -14,7 +14,7 @@
 def calculate(func, args):
     result = func(*args)
     return '%s says that %s%s = %s' % (
-        multiprocessing.current_process().get_name(),
+        multiprocessing.current_process().name,
         func.__name__, args, result
         )
 

Doc/includes/mp_synchronize.py

@@ -224,7 +224,7 @@ def test_sharedvalues():
     p.start()
     p.join()
 
-    assert p.get_exitcode() == 0
+    assert p.exitcode == 0
 
 
 ####

Doc/includes/mp_webserver.py

@@ -21,7 +21,7 @@
 
 
 def note(format, *args):
-    sys.stderr.write('[%s]\t%s\n' % (current_process().get_name(),format%args))
+    sys.stderr.write('[%s]\t%s\n' % (current_process().name, format%args))
 
 
 class RequestHandler(SimpleHTTPRequestHandler):

Doc/includes/mp_workers.py

@@ -29,7 +29,7 @@ def worker(input, output):
 def calculate(func, args):
     result = func(*args)
     return '%s says that %s%s = %s' % \
-        (current_process().get_name(), func.__name__, args, result)
+        (current_process().name, func.__name__, args, result)
 
 #
 # Functions referenced by tasks

Doc/library/multiprocessing.rst

@@ -292,11 +292,11 @@ The :mod:`multiprocessing` package mostly replicates the API of the
       A process cannot join itself because this would cause a deadlock.  It is
       an error to attempt to join a process before it has been started.
 
-   .. method:: get_name()
+   .. attribute:: Process.name
 
       Return the process's name.
 
-   .. method:: set_name(name)
+   .. attribute:: Process.name = name
 
       Set the process's name.
 
@@ -311,11 +311,11 @@ The :mod:`multiprocessing` package mostly replicates the API of the
       Roughly, a process object is alive from the moment the :meth:`start`
       method returns until the child process terminates.
 
-   .. method:: is_daemon()
+   .. attribute:: Process.daemon
 
-      Return the process's daemon flag.
+      Return the process's daemon flag., this is a boolean.
 
-   .. method:: set_daemon(daemonic)
+   .. attribute:: Process.daemon = daemonic
 
       Set the process's daemon flag to the Boolean value *daemonic*.  This must
       be called before :meth:`start` is called.
@@ -331,18 +331,18 @@ The :mod:`multiprocessing` package mostly replicates the API of the
 
    In addition process objects also support the following methods:
 
-   .. method:: get_pid()
+   .. attribute:: Process.pid
 
       Return the process ID.  Before the process is spawned, this will be
       ``None``.
 
-   .. method:: get_exit_code()
+   .. attribute:: Process.exitcode
 
       Return the child's exit code.  This will be ``None`` if the process has
       not yet terminated.  A negative value *-N* indicates that the child was
       terminated by signal *N*.
 
-   .. method:: get_auth_key()
+   .. attribute:: Process.authkey
 
       Return the process's authentication key (a byte string).
 
@@ -351,11 +351,11 @@ The :mod:`multiprocessing` package mostly replicates the API of the
 
       When a :class:`Process` object is created, it will inherit the
       authentication key of its parent process, although this may be changed
-      using :meth:`set_auth_key` below.
+      using :attr:`Process.authkey` below.
 
       See :ref:`multiprocessing-auth-keys`.
 
-   .. method:: set_auth_key(authkey)
+   .. attribute:: Process.authkey = authkey
 
       Set the process's authentication key which must be a byte string.
 

Lib/multiprocessing/dummy/__init__.py

@@ -47,7 +47,8 @@ def start(self):
         self._parent._children[self] = None
         threading.Thread.start(self)
 
-    def get_exitcode(self):
+    @property
+    def exitcode(self):
         if self._start_called and not self.is_alive():
             return 0
         else:

Lib/multiprocessing/forking.py

@@ -360,7 +360,7 @@ def get_preparation_data(name):
             sys_argv=sys.argv,
             log_to_stderr=_log_to_stderr,
             orig_dir=process.ORIGINAL_DIR,
-            authkey=process.current_process().get_authkey(),
+            authkey=process.current_process().authkey,
             )
 
         if _logger is not None:
@@ -407,7 +407,7 @@ def prepare(data):
     old_main_modules.append(sys.modules['__main__'])
 
     if 'name' in data:
-        process.current_process().set_name(data['name'])
+        process.current_process().name = data['name']
 
     if 'authkey' in data:
         process.current_process()._authkey = data['authkey']

Lib/multiprocessing/managers.py

@@ -444,7 +444,7 @@ class BaseManager(object):
 
     def __init__(self, address=None, authkey=None, serializer='pickle'):
         if authkey is None:
-            authkey = current_process().get_authkey()
+            authkey = current_process().authkey
         self._address = address     # XXX not final address if eg ('', 0)
         self._authkey = AuthenticationString(authkey)
         self._state = State()
@@ -489,7 +489,7 @@ def start(self):
                   self._serializer, writer),
             )
         ident = ':'.join(str(i) for i in self._process._identity)
-        self._process.set_name(type(self).__name__  + '-' + ident)
+        self._process.name = type(self).__name__  + '-' + ident
         self._process.start()
 
         # get address of server
@@ -690,7 +690,7 @@ def __init__(self, token, serializer, manager=None,
         elif self._manager is not None:
             self._authkey = self._manager._authkey
         else:
-            self._authkey = current_process().get_authkey()
+            self._authkey = current_process().authkey
 
         if incref:
             self._incref()
@@ -699,7 +699,7 @@ def __init__(self, token, serializer, manager=None,
 
     def _connect(self):
         util.debug('making connection to manager')
-        name = current_process().get_name()
+        name = current_process().name
         if threading.current_thread().name != 'MainThread':
             name += '|' + threading.current_thread().name
         conn = self._Client(self._token.address, authkey=self._authkey)
@@ -880,7 +880,7 @@ def AutoProxy(token, serializer, manager=None, authkey=None,
     if authkey is None and manager is not None:
         authkey = manager._authkey
     if authkey is None:
-        authkey = current_process().get_authkey()
+        authkey = current_process().authkey
 
     ProxyType = MakeProxyType('AutoProxy[%s]' % token.typeid, exposed)
     proxy = ProxyType(token, serializer, manager=manager, authkey=authkey,

Lib/multiprocessing/pool.py

@@ -99,7 +99,7 @@ def __init__(self, processes=None, initializer=None, initargs=()):
                 args=(self._inqueue, self._outqueue, initializer, initargs)
                 )
             self._pool.append(w)
-            w.name = w.get_name().replace('Process', 'PoolWorker')
+            w.name = w.name.replace('Process', 'PoolWorker')
             w.daemon = True
             w.start()
 

Lib/multiprocessing/process.py

@@ -132,45 +132,43 @@ def is_alive(self):
         self._popen.poll()
         return self._popen.returncode is None
 
-    def get_name(self):
+    @property
-        '''
+    def name(self):
-        Return name of process
-        '''
         return self._name
 
-    def set_name(self, name):
+    @name.setter
-        '''
+    def name(self, name):
-        Set name of process
-        '''
         assert isinstance(name, str), 'name must be a string'
         self._name = name
 
-    def is_daemon(self):
+    @property
+    def daemon(self):
         '''
         Return whether process is a daemon
         '''
         return self._daemonic
 
-    def set_daemon(self, daemonic):
+    @daemon.setter
+    def daemon(self, daemonic):
         '''
         Set whether process is a daemon
         '''
         assert self._popen is None, 'process has already started'
         self._daemonic = daemonic
 
-    def get_authkey(self):
+    @property
-        '''
+    def authkey(self):
-        Return authorization key of process
-        '''
         return self._authkey
 
-    def set_authkey(self, authkey):
+    @authkey.setter
+    def authkey(self, authkey):
         '''
         Set authorization key of process
         '''
         self._authkey = AuthenticationString(authkey)
 
-    def get_exitcode(self):
+    @property
+    def exitcode(self):
         '''
         Return exit code of process or `None` if it has yet to stop
         '''
@@ -178,7 +176,8 @@ def get_exitcode(self):
             return self._popen
         return self._popen.poll()
 
-    def get_ident(self):
+    @property
+    def ident(self):
         '''
         Return indentifier (PID) of process or `None` if it has yet to start
         '''
@@ -187,7 +186,7 @@ def get_ident(self):
         else:
             return self._popen and self._popen.pid
 
-    pid = property(get_ident)
+    pid = ident
 
     def __repr__(self):
         if self is _current_process:
@@ -198,7 +197,7 @@ def __repr__(self):
             status = 'initial'
         else:
             if self._popen.poll() is not None:
-                status = self.get_exitcode()
+                status = self.exitcode
             else:
                 status = 'started'
 
@@ -245,7 +244,7 @@ def _bootstrap(self):
         except:
             exitcode = 1
             import traceback
-            sys.stderr.write('Process %s:\n' % self.get_name())
+            sys.stderr.write('Process %s:\n' % self.name)
             sys.stderr.flush()
             traceback.print_exc()
 

Lib/multiprocessing/reduction.py

@@ -81,9 +81,9 @@ def _get_listener():
         try:
             if _listener is None:
                 debug('starting listener and thread for sending handles')
-                _listener = Listener(authkey=current_process().get_authkey())
+                _listener = Listener(authkey=current_process().authkey)
                 t = threading.Thread(target=_serve)
-                t.set_daemon(True)
+                t.daemon = True
                 t.start()
         finally:
             _lock.release()
@@ -126,7 +126,7 @@ def rebuild_handle(pickled_data):
     if inherited:
         return handle
     sub_debug('rebuilding handle %d', handle)
-    conn = Client(address, authkey=current_process().get_authkey())
+    conn = Client(address, authkey=current_process().authkey)
     conn.send((handle, os.getpid()))
     new_handle = recv_handle(conn)
     conn.close()

Lib/multiprocessing/synchronize.py

@@ -108,9 +108,9 @@ def __init__(self):
     def __repr__(self):
         try:
             if self._semlock._is_mine():
-                name = current_process().get_name()
+                name = current_process().name
-                if threading.current_thread().get_name() != 'MainThread':
+                if threading.current_thread().name != 'MainThread':
-                    name += '|' + threading.current_thread().get_name()
+                    name += '|' + threading.current_thread().name
             elif self._semlock._get_value() == 1:
                 name = 'None'
             elif self._semlock._count() > 0:
@@ -133,9 +133,9 @@ def __init__(self):
     def __repr__(self):
         try:
             if self._semlock._is_mine():
-                name = current_process().get_name()
+                name = current_process().name
-                if threading.current_thread().get_name() != 'MainThread':
+                if threading.current_thread().name != 'MainThread':
-                    name += '|' + threading.current_thread().get_name()
+                    name += '|' + threading.current_thread().name
                 count = self._semlock._count()
             elif self._semlock._get_value() == 1:
                 name, count = 'None', 0

Lib/multiprocessing/util.py

@@ -273,11 +273,11 @@ def _exit_function():
 
     for p in active_children():
         if p._daemonic:
-            info('calling terminate() for daemon %s', p.get_name())
+            info('calling terminate() for daemon %s', p.name)
             p._popen.terminate()
 
     for p in active_children():
-        info('calling join() for process %s', p.get_name())
+        info('calling join() for process %s', p.name)
         p.join()
 
     debug('running the remaining "atexit" finalizers')

Lib/test/test_multiprocessing.py

@@ -119,22 +119,22 @@ def test_current(self):
             return
 
         current = self.current_process()
-        authkey = current.get_authkey()
+        authkey = current.authkey
 
         self.assertTrue(current.is_alive())
-        self.assertTrue(not current.is_daemon())
+        self.assertTrue(not current.daemon)
         self.assertTrue(isinstance(authkey, bytes))
         self.assertTrue(len(authkey) > 0)
-        self.assertEqual(current.get_ident(), os.getpid())
+        self.assertEqual(current.ident, os.getpid())
-        self.assertEqual(current.get_exitcode(), None)
+        self.assertEqual(current.exitcode, None)
 
     def _test(self, q, *args, **kwds):
         current = self.current_process()
         q.put(args)
         q.put(kwds)
-        q.put(current.get_name())
+        q.put(current.name)
         if self.TYPE != 'threads':
-            q.put(bytes(current.get_authkey()))
+            q.put(bytes(current.authkey))
             q.put(current.pid)
 
     def test_process(self):
@@ -146,33 +146,33 @@ def test_process(self):
         p = self.Process(
             target=self._test, args=args, kwargs=kwargs, name=name
             )
-        p.set_daemon(True)
+        p.daemon = True
         current = self.current_process()
 
         if self.TYPE != 'threads':
-            self.assertEquals(p.get_authkey(), current.get_authkey())
+            self.assertEquals(p.authkey, current.authkey)
         self.assertEquals(p.is_alive(), False)
-        self.assertEquals(p.is_daemon(), True)
+        self.assertEquals(p.daemon, True)
         self.assertTrue(p not in self.active_children())
         self.assertTrue(type(self.active_children()) is list)
-        self.assertEqual(p.get_exitcode(), None)
+        self.assertEqual(p.exitcode, None)
 
         p.start()
 
-        self.assertEquals(p.get_exitcode(), None)
+        self.assertEquals(p.exitcode, None)
         self.assertEquals(p.is_alive(), True)
         self.assertTrue(p in self.active_children())
 
         self.assertEquals(q.get(), args[1:])
         self.assertEquals(q.get(), kwargs)
-        self.assertEquals(q.get(), p.get_name())
+        self.assertEquals(q.get(), p.name)
         if self.TYPE != 'threads':
-            self.assertEquals(q.get(), current.get_authkey())
+            self.assertEquals(q.get(), current.authkey)
             self.assertEquals(q.get(), p.pid)
 
         p.join()
 
-        self.assertEquals(p.get_exitcode(), 0)
+        self.assertEquals(p.exitcode, 0)
         self.assertEquals(p.is_alive(), False)
         self.assertTrue(p not in self.active_children())
 
@@ -184,12 +184,12 @@ def test_terminate(self):
             return
 
         p = self.Process(target=self._test_terminate)
-        p.set_daemon(True)
+        p.daemon = True
         p.start()
 
         self.assertEqual(p.is_alive(), True)
         self.assertTrue(p in self.active_children())
-        self.assertEqual(p.get_exitcode(), None)
+        self.assertEqual(p.exitcode, None)
 
         p.terminate()
 
@@ -202,8 +202,8 @@ def test_terminate(self):
 
         p.join()
 
-        # XXX sometimes get p.get_exitcode() == 0 on Windows ...
+        # XXX sometimes get p.exitcode == 0 on Windows ...
-        #self.assertEqual(p.get_exitcode(), -signal.SIGTERM)
+        #self.assertEqual(p.exitcode, -signal.SIGTERM)
 
     def test_cpu_count(self):
         try:
@@ -330,7 +330,7 @@ def test_put(self):
             target=self._test_put,
             args=(queue, child_can_start, parent_can_continue)
             )
-        proc.set_daemon(True)
+        proc.daemon = True
         proc.start()
 
         self.assertEqual(queue_empty(queue), True)
@@ -396,7 +396,7 @@ def test_get(self):
             target=self._test_get,
             args=(queue, child_can_start, parent_can_continue)
             )
-        proc.set_daemon(True)
+        proc.daemon = True
         proc.start()
 
         self.assertEqual(queue_empty(queue), True)
@@ -619,16 +619,10 @@ def test_notify(self):
         woken = self.Semaphore(0)
 
         p = self.Process(target=self.f, args=(cond, sleeping, woken))
-        try:
-            p.set_daemon(True)
-        except AttributeError:
         p.daemon = True
         p.start()
 
         p = threading.Thread(target=self.f, args=(cond, sleeping, woken))
-        try:
-            p.set_daemon(True)
-        except AttributeError:
         p.daemon = True
         p.start()
 
@@ -671,7 +665,7 @@ def test_notify_all(self):
         for i in range(3):
             p = self.Process(target=self.f,
                              args=(cond, sleeping, woken, TIMEOUT1))
-            p.set_daemon(True)
+            p.daemon = True
             p.start()
 
             t = threading.Thread(target=self.f,
@@ -694,7 +688,7 @@ def test_notify_all(self):
         # start some more threads/processes
         for i in range(3):
             p = self.Process(target=self.f, args=(cond, sleeping, woken))
-            p.set_daemon(True)
+            p.daemon = True
             p.start()
 
             t = threading.Thread(target=self.f, args=(cond, sleeping, woken))
@@ -1191,7 +1185,7 @@ def test_connection(self):
         conn, child_conn = self.Pipe()
 
         p = self.Process(target=self._echo, args=(child_conn,))
-        p.set_daemon(True)
+        p.daemon = True
         p.start()
 
         seq = [1, 2.25, None]
@@ -1340,7 +1334,7 @@ def test_listener_client(self):
         for family in self.connection.families:
             l = self.connection.Listener(family=family)
             p = self.Process(target=self._test, args=(l.address,))
-            p.set_daemon(True)
+            p.daemon = True
             p.start()
             conn = l.accept()
             self.assertEqual(conn.recv(), 'hello')