Issue #15064: Use with-blocks for some examples in docs.
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Richard Oudkerk
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ac38571f00
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633c4d9199
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@ -241,17 +241,16 @@ However, if you really do need to use some shared data then
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l.reverse()
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if __name__ == '__main__':
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manager = Manager()
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with Manager() as manager:
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d = manager.dict()
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l = manager.list(range(10))
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d = manager.dict()
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l = manager.list(range(10))
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p = Process(target=f, args=(d, l))
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p.start()
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p.join()
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p = Process(target=f, args=(d, l))
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p.start()
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p.join()
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print(d)
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print(l)
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print(d)
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print(l)
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will print ::
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@ -279,10 +278,10 @@ For example::
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return x*x
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if __name__ == '__main__':
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pool = Pool(processes=4) # start 4 worker processes
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result = pool.apply_async(f, [10]) # evaluate "f(10)" asynchronously
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print(result.get(timeout=1)) # prints "100" unless your computer is *very* slow
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print(pool.map(f, range(10))) # prints "[0, 1, 4,..., 81]"
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with Pool(processes=4) as pool # start 4 worker processes
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result = pool.apply_async(f, [10]) # evaluate "f(10)" asynchronously
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print(result.get(timeout=1)) # prints "100" unless your computer is *very* slow
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print(pool.map(f, range(10))) # prints "[0, 1, 4,..., 81]"
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Reference
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@ -1426,11 +1425,10 @@ callables with the manager class. For example::
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MyManager.register('Maths', MathsClass)
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if __name__ == '__main__':
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manager = MyManager()
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manager.start()
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maths = manager.Maths()
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print(maths.add(4, 3)) # prints 7
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print(maths.mul(7, 8)) # prints 56
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with MyManager() as manager:
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maths = manager.Maths()
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print(maths.add(4, 3)) # prints 7
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print(maths.mul(7, 8)) # prints 56
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Using a remote manager
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@ -1798,21 +1796,20 @@ The following example demonstrates the use of a pool::
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return x*x
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if __name__ == '__main__':
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pool = Pool(processes=4) # start 4 worker processes
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with Pool(processes=4) as pool: # start 4 worker processes
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result = pool.apply_async(f, (10,)) # evaluate "f(10)" asynchronously
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print(result.get(timeout=1)) # prints "100" unless your computer is *very* slow
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result = pool.apply_async(f, (10,)) # evaluate "f(10)" asynchronously
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print(result.get(timeout=1)) # prints "100" unless your computer is *very* slow
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print(pool.map(f, range(10))) # prints "[0, 1, 4,..., 81]"
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print(pool.map(f, range(10))) # prints "[0, 1, 4,..., 81]"
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it = pool.imap(f, range(10))
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print(next(it)) # prints "0"
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print(next(it)) # prints "1"
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print(it.next(timeout=1)) # prints "4" unless your computer is *very* slow
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it = pool.imap(f, range(10))
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print(next(it)) # prints "0"
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print(next(it)) # prints "1"
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print(it.next(timeout=1)) # prints "4" unless your computer is *very* slow
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import time
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result = pool.apply_async(time.sleep, (10,))
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print(result.get(timeout=1)) # raises TimeoutError
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import time
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result = pool.apply_async(time.sleep, (10,))
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print(result.get(timeout=1)) # raises TimeoutError
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.. _multiprocessing-listeners-clients:
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@ -1984,19 +1981,16 @@ the client::
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from array import array
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address = ('localhost', 6000) # family is deduced to be 'AF_INET'
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listener = Listener(address, authkey=b'secret password')
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conn = listener.accept()
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print('connection accepted from', listener.last_accepted)
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with Listener(address, authkey=b'secret password') as listener:
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with listener.accept() as conn:
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print('connection accepted from', listener.last_accepted)
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conn.send([2.25, None, 'junk', float])
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conn.send([2.25, None, 'junk', float])
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conn.send_bytes(b'hello')
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conn.send_bytes(b'hello')
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conn.send_bytes(array('i', [42, 1729]))
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conn.close()
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listener.close()
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conn.send_bytes(array('i', [42, 1729]))
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The following code connects to the server and receives some data from the
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server::
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@ -2005,17 +1999,15 @@ server::
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from array import array
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address = ('localhost', 6000)
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conn = Client(address, authkey=b'secret password')
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print(conn.recv()) # => [2.25, None, 'junk', float]
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with Client(address, authkey=b'secret password') as conn:
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print(conn.recv()) # => [2.25, None, 'junk', float]
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print(conn.recv_bytes()) # => 'hello'
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print(conn.recv_bytes()) # => 'hello'
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arr = array('i', [0, 0, 0, 0, 0])
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print(conn.recv_bytes_into(arr)) # => 8
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print(arr) # => array('i', [42, 1729, 0, 0, 0])
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conn.close()
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arr = array('i', [0, 0, 0, 0, 0])
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print(conn.recv_bytes_into(arr)) # => 8
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print(arr) # => array('i', [42, 1729, 0, 0, 0])
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The following code uses :func:`~multiprocessing.connection.wait` to
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wait for messages from multiple processes at once::
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