why does the following with Queue, q.put('\x02', True) not put itin the queue?

Discussion in 'Python' started by Gabriel Rossetti, Apr 25, 2008.

  1. Hello,

    I'm having some trouble with the Queue class, for some reason, if I do
    this (ch == ) :

    q = Queue.Queue(0)
    repr(ch)
    q.put(ch, True)
    len(q.queue)

    where the output is :

    '\x02'
    0

    why isn't the character/string being put it in the queue?

    Thank you,
    Gabriel
     
    Gabriel Rossetti, Apr 25, 2008
    #1
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  2. Gabriel Rossetti

    sturlamolden Guest

    On Apr 25, 4:38 pm, Gabriel Rossetti
    <> wrote:
    > Hello,
    >
    > I'm having some trouble with the Queue class, for some reason, if I do
    > this (ch == ) :
    >
    > q = Queue.Queue(0)
    > repr(ch)
    > q.put(ch, True)
    > len(q.queue)


    >>> from Queue import Queue
    >>> q = Queue(0)
    >>> s = '\x02'
    >>> q.put(s,True)
    >>> len(q.queue)

    1
     
    sturlamolden, Apr 25, 2008
    #2
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  3. Re: why does the following with Queue, q.put('\x02', True) not putit in the queue?

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    sturlamolden wrote:
    > On Apr 25, 4:38 pm, Gabriel Rossetti
    > <> wrote:
    >
    >> Hello,
    >>
    >> I'm having some trouble with the Queue class, for some reason, if I do
    >> this (ch == ) :
    >>
    >> q = Queue.Queue(0)
    >> repr(ch)
    >> q.put(ch, True)
    >> len(q.queue)
    >>

    >
    >
    >>>> from Queue import Queue
    >>>> q = Queue(0)
    >>>> s = '\x02'
    >>>> q.put(s,True)
    >>>> len(q.queue)
    >>>>

    > 1
    >
    >
    >
    >

    yes, if you do it that way (s = '\x02') it works, but I read the data
    from a file, and I that way it doesn't work....
     
    Gabriel Rossetti, Apr 25, 2008
    #3
  4. Gabriel Rossetti

    Jerry Hill Guest

    Re: why does the following with Queue, q.put('\x02',True) not put it in the queue?

    On Fri, Apr 25, 2008 at 11:11 AM, Gabriel Rossetti
    <> wrote:
    > yes, if you do it that way (s = '\x02') it works, but I read the data from
    > a file, and I that way it doesn't work....


    It does work (using Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45)
    [MSC v.1310 32 bit (Intel)] on win32)

    import Queue
    f = open('temp', 'w')
    f.write('\x02')
    f.close()

    f = open('temp', 'r')
    ch = f.read(1)
    f.close()

    print repr(ch)
    q = Queue.Queue(0)
    q.put(ch, True)
    print len(q.queue)

    prints the following:
    '\x02'
    1

    Perhaps you could put together an example that actually shows the
    behavior you're seeing. I'm not super familiar with Queue.Queue
    internals, but should you be accessing the undocumented q.queue (the
    internal deque of the Queue instance) directly? Shouldn't you be
    using the documented q.qsize() interface instead?

    --
    Jerry
     
    Jerry Hill, Apr 25, 2008
    #4
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