New submission from Ram Rachum <cool...@cool-rr.com>: Hello,
I found this bit in my inbox, I forgot why I cared about it, but it raises an exception (at least on Windows): >>> import multiprocessing >>> p = multiprocessing.Process(target=bytes.maketrans, args=(b'abc', b'xyz')) >>> p.start() Traceback (most recent call last): File "C:\Python32\Lib\pickle.py", line 679, in save_global klass = getattr(mod, name) AttributeError: 'module' object has no attribute 'maketrans' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python32\Lib\multiprocessing\process.py", line 130, in start self._popen = Popen(self) File "C:\Python32\Lib\multiprocessing\forking.py", line 267, in __init__ dump(process_obj, to_child, HIGHEST_PROTOCOL) File "C:\Python32\Lib\multiprocessing\forking.py", line 190, in dump ForkingPickler(file, protocol).dump(obj) File "C:\Python32\Lib\pickle.py", line 237, in dump self.save(obj) File "C:\Python32\Lib\pickle.py", line 344, in save self.save_reduce(obj=obj, *rv) File "C:\Python32\Lib\pickle.py", line 432, in save_reduce save(state) File "C:\Python32\Lib\pickle.py", line 299, in save f(self, obj) # Call unbound method with explicit self File "C:\Python32\Lib\pickle.py", line 623, in save_dict self._batch_setitems(obj.items()) File "C:\Python32\Lib\pickle.py", line 656, in _batch_setitems save(v) File "C:\Python32\Lib\pickle.py", line 299, in save f(self, obj) # Call unbound method with explicit self File "C:\Python32\Lib\pickle.py", line 683, in save_global (obj, module, name)) _pickle.PicklingError: Can't pickle <built-in function maketrans>: it's not found as __main__.maketrans If you do the same things with `threading.Thread`, it works, but for `multiprocessing.Process` it doesn't. Is this a general problem with pickling "unbound methods"? ---------- components: Interpreter Core, Library (Lib) messages: 134907 nosy: cool-RR priority: normal severity: normal status: open title: Can't launch Process on built-in static method type: behavior versions: Python 3.3, Python 3.4 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11969> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com