New submission from Ram Rachum <[email protected]>:
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
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Python tracker <[email protected]>
<http://bugs.python.org/issue11969>
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