Почему не удается запустить процессы в multiprocessing?

Question

[sharkyyy3]

from multiprocessing import Process
import time

def test_multiprocessing():

            def func1():
                print('test1')
                time.sleep(10)
            def func2():
                print('test2')
                time.sleep(5)

            p_func1 = Process(target=func1)
            p_func2 = Process(target=func2)
            p_func1.start()
            p_func2.start()

            p_func1.join()
            p_func2.join()
            print('done')


test_multiprocessing()

После выполнения кода следуют ошибки:

Traceback (most recent call last):
  File "C:/Users/Admin/PycharmProjects/asy/main_asy.py", line 32, in <module>
    test_multiprocessing()
  File "C:/Users/Admin/PycharmProjects/asy/main_asy.py", line 24, in test_multiprocessing
    p_func1.start()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 313, in _Popen
    return Popen(process_obj)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\popen_spawn_win32.py", line 66, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\reduction.py", line 59, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'test_multiprocessing.<locals>.func1'

Answer 1

[tsarevfs]

Он не справляется с локальным обьявлением func1 и func2. Просто обьявите их на том же уровне как и test_multiprocessing.

Comments

[sharkyyy3]

Тоже не вариант

spoiler

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 106, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 115, in _main
    prepare(preparation_data)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 226, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 278, in _fixup_main_from_path
    run_name="__mp_main__")
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Admin\PycharmProjects\asy\main_asy.py", line 36, in <module>
    test_multiprocessing()
  File "C:\Users\Admin\PycharmProjects\asy\main_asy.py", line 28, in test_multiprocessing
    p_func1.start()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 313, in _Popen
    return Popen(process_obj)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\popen_spawn_win32.py", line 34, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 144, in get_preparation_data
    _check_not_importing_main()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 137, in _check_not_importing_main
    is not going to be frozen to produce an executable.''')
RuntimeError: 
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:

            if __name__ == '__main__':
                freeze_support()
                ...

        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 106, in spawn_main
    exitcode = _main(fd)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 115, in _main
    prepare(preparation_data)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 226, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 278, in _fixup_main_from_path
    run_name="__mp_main__")
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Admin\PycharmProjects\asy\main_asy.py", line 36, in <module>
    test_multiprocessing()
  File "C:\Users\Admin\PycharmProjects\asy\main_asy.py", line 28, in test_multiprocessing
    p_func1.start()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\context.py", line 313, in _Popen
    return Popen(process_obj)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\popen_spawn_win32.py", line 34, in __init__
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 144, in get_preparation_data
    _check_not_importing_main()
  File "C:\Users\Admin\AppData\Local\Programs\Python\Python35\lib\multiprocessing\spawn.py", line 137, in _check_not_importing_main
    is not going to be frozen to produce an executable.''')
RuntimeError: 
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:

            if __name__ == '__main__':
                freeze_support()
                ...

        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.
done

[sharkyyy3]

sharkyyy3,

from multiprocessing import Process
import time

print(1)

def func1():
    print('test1')
    time.sleep(10)


def func2():
    print('test2')
    time.sleep(5)

def test_multiprocessing():
    if __name__ == '__main__':
            p_func1 = Process(target=func1)
            p_func2 = Process(target=func2)
            p_func1.start()
            p_func2.start()
            p_func1.join()
            p_func2.join()
            print('done')

Answer 2

[ScriptKiddo]

spoiler

from multiprocessing import Process
import time

print(1)


def func1():
    print('test1')
    time.sleep(10)


def func2():
    print('test2')
    time.sleep(5)


def test_multiprocessing():
    p_func1 = Process(target=func1)
    p_func2 = Process(target=func2)
    p_func1.start()
    p_func2.start()
    p_func1.join()
    p_func2.join()
    print('done')


if __name__ == '__main__':
    test_multiprocessing()

Out:

1
11

test2
test1
done

Process finished with exit code 0

Python 3.7 64bit Windows 10 1903