Question

我正在尝试python-gasp在Windows上工作，但当我import gasp; gasp.begin_graphics()时，我得到以下追溯：

  File "C:\Python26\lib\site-packages\gasp\backend.py", line 142, in create_screen

    screen.updater.start()

  File "C:\Python26\lib\multiprocessing\process.py", line 104, in start

    self._popen = Popen(self)

  File "C:\Python26\lib\multiprocessing\forking.py", line 239, in __init__

    dump(process_obj, to_child, HIGHEST_PROTOCOL)

  File "C:\Python26\lib\multiprocessing\forking.py", line 162, in dump

    ForkingPickler(file, protocol).dump(obj)

  File "C:\Python26\lib\pickle.py", line 224, in dump

    self.save(obj)

  File "C:\Python26\lib\pickle.py", line 331, in save

    self.save_reduce(obj=obj, *rv)

  File "C:\Python26\lib\pickle.py", line 419, in save_reduce

    save(state)

  File "C:\Python26\lib\pickle.py", line 286, in save

    f(self, obj) # Call unbound method with explicit self

  File "C:\Python26\lib\pickle.py", line 649, in save_dict

    self._batch_setitems(obj.iteritems())

  File "C:\Python26\lib\pickle.py", line 681, in _batch_setitems

    save(v)

  File "C:\Python26\lib\pickle.py", line 286, in save

    f(self, obj) # Call unbound method with explicit self

  File "C:\Python26\lib\pickle.py", line 725, in save_inst

    save(stuff)

  File "C:\Python26\lib\pickle.py", line 286, in save

    f(self, obj) # Call unbound method with explicit self

  File "C:\Python26\lib\pickle.py", line 649, in save_dict

    self._batch_setitems(obj.iteritems())

  File "C:\Python26\lib\pickle.py", line 681, in _batch_setitems

    save(v)

  File "C:\Python26\lib\pickle.py", line 331, in save

    self.save_reduce(obj=obj, *rv)

  File "C:\Python26\lib\pickle.py", line 396, in save_reduce

    save(cls)

  File "C:\Python26\lib\pickle.py", line 286, in save

    f(self, obj) # Call unbound method with explicit self

  File "C:\Python26\lib\pickle.py", line 748, in save_global

    (obj, module, name))

PicklingError: Can't pickle <class 'multiprocessing.process._MainProcess'>: it's not found as multiprocessing.process._MainProcess

我知道为什么我在Windows XP上遇到此错误但在Ubuntu Linux 9.04上却没有？

看起来screen.updater是Updater(multiprocessing.Process)（def）的一个实例，如果有帮助的话。相关文件位于http://bazaar.launchpad.net/~gasp-dev/gasp-core/main/annotate/head%3A/gasp/backend.py

Answer 1

您的Updater班级有一名成员screen，其成员process的成员资格为multiprocessing.current_process()。

当您致电updater.start()时，它会尝试挑选更新程序。这只发生在Windows上，因为Linux使用fork()而不是pickling。但是，无法对当前进程对象进行pickle并引发异常。

要解决此问题，您可以删除process成员。

multiprocessing.Process子类适用于Linux但不适用于Windows

1 个答案: