import Queue
b = Queue.Queue(0)
b.put(9999)
b.get() # this is ok, it pops out 9999
b.get() # this one does not return anything and is hang on
there
Anybody knows what is going on with the second b.get()?
>>help(Queue.Qu eue)
:
:
| get(self, block=True, timeout=None)
| Remove and return an item from the queue.
|
| If optional args 'block' is true and
| 'timeout' is None (the default), block if
| necessary until an item is available. If
| 'timeout' is a positive number, it blocks
| at most 'timeout' seconds and raises the
| Empty exception if no item was available
| within that time. Otherwise ('block' is
| false), return an item if one is
| immediately available, else raise the
| Empty exception ('timeout' is ignored in
| that case).
|
| get_nowait(self )
| Remove and return an item from the queue
| without blocking.
|
| Only get an item if one is immediately
| available. Otherwise raise the Empty
| exception.
:
:
Notice that by default, get() will block until
there's something to read. You can use either
b.get(block=Fal se)
or
b.get_nowait()
In either case, an exception will be raised when
the Queue is empty, to let you know as much. Just
trap for the exception and do as you please.
-tkc
