def get_task(self, task=<NUM_LIT:0>, timeout=None, block=True):
return _NuMapTask(self, task=task, timeout=timeout, block=block)<EOL>
Returns an iterator which results are limited to one **task**. The 
default iterator the one which e.g. will be used in a for loop is the
iterator for the first task (task =0). The returned iterator is a 
``_NuMapTask`` instance.

Compare::

    for result_from_task_0 in imap_instance:
        pass

with::

    for result_from_task_1 in imap_instance.get_task(task_id =1):
        pass

a typical use case is::

    task_0_iterator = imap_instance.get_task(task_id =0)
    task_1_iterator = imap_instance.get_task(task_id =1)

    for (task_1_res, task_0_res) in izip(task_0_iterator, task_1_iterator):
        pass