代码：

import time
import random

from multiprocessing import Process, Lock


class WriteProcess(Process):
   """ 写入文件 """

   def __init__(self, file_name,  num, my_lock, *args, **kwargs):
       # 文件的名称
       self.file_name = file_name
       self.num = num
       # 锁对象
       self.my_lock = my_lock
       super().__init__(*args, **kwargs)

   def run(self):
       """ 写入文件的主要业务逻辑 """
       try:
           # 添加锁
           self.my_lock.acquire()
           for i in range(5):
               content = '现在是: {0}: {1}---{2} \n'.format(self.name, self.pid, self.num)

               with open(self.file_name, 'a+', encoding='utf-8') as f:
                   f.write(content)
                   time.sleep(random.randint(1, 5))
                   print(content)
       finally:
           # 释放锁
           self.my_lock.release()


if __name__ == "__main__":
   file_name = 'test_txt'
   # 锁的对象
   my_lock = Lock()
   for x in range(5):
       p = WriteProcess(file_name, x, my_lock)
       p.start()

报错信息：

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

Process finished with exit code 0