多处理导致错误的无限循环

Question

在osx Big Sur上使用python 3.8

台词

import multiprocessing as mp
pool = mp.Pool(2)

导致错误的无限循环，但下面收集了其中的一个片段

此外，mp.freeze\u support（）似乎也没有帮助

Traceback (most recent call last):
  File "<string>", line 1, in <module>
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 125, in _main
    exitcode = _main(fd, parent_sentinel)
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 125, in _main
    prepare(preparation_data)
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 236, in prepare
    prepare(preparation_data)
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 236, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
    _fixup_main_from_path(data['init_main_from_path'])
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
    main_content = runpy.run_path(main_path,
  File "/Users/biscuit/.conda/envs/advanced-projects/lib/python3.8/runpy.py", line 264, in run_path
    main_content = runpy.run_path(main_path,
.
.
.

你知道为什么吗

编辑：

当时没有一个解决方案奏效，但今天似乎奏效了？我确实安装了一些其他软件包，这些软件包让我对依赖项进行更新，所以可能它更改了我的多处理版本，或者其他软件包版本修复了它

不管是哪种方式，现在都可以了，对不起，这对其他人没有多大帮助

Answer 1

特别是当启动方法为“spawn”（MacOS上的默认值）时：

只能在if __name__ == "__main__":块内创建子进程（创建池会创建子进程），因为子进程导入__main__文件。当该导入发生时，文件将被执行（就像任何导入一样），并且您将递归地继续创建越来越多的子进程，除非某种事情（如if __name__ ...块）将执行限制为仅父进程