multithreading - iterating over methods - Python -

i've created following threading utility, inside class domain:

def __run_threads(self, targets):         concurrent.futures.threadpoolexecutor(max_workers=5) executor:             future_job = { executor.submit(target): target target in targets }             future in concurrent.futures.as_completed(future_job):                 try:                     data = future.result()                 except exception exc:                     self.log.exception(exc)                 else:                     self.log.info("data: %s" % data) 

that's it, may want terminate or initiate node, belongs class domain. in order make generic possible, want pass targets list, array of target executed:

targets = [ node.terminate_instance node in self.nodes ] 

or

targets = [ node.start_instance node in new_nodes ] self.__run_threads(targets) 

however, when execute function get:

test_domain.py", line 19, in test_constructor     dobj = domain.domain(name="test_domain", cluster_size=1)   file "domain.py", line 31, in __init__     self.__run_threads(om_node.start_instance)   file "domain.py", line 71, in __run_threads     future_job = { executor.submit(target): target target in targets } typeerror: 'instancemethod' object not iterable 

how can iterate on list of methods in python?

the traceback shows you're doing this:

self.__run_threads(om_node.start_instance) 

so you're passing single method instance __run_threads, rather list of instance methods, method expects (and explicitly stated want pass it). need make caller pass list:

self.__run_threads([om_node.start_instance]) # or list comprehension provides multiple instance methods, in examples.