AttributeError: module 'os' has no attribute 'fork'
import os
print('Process (%s) start...' % os.getpid())
# Only works on Unix/Linux/Mac:
pid = os.fork() #不要在windows系统中使用，会出错，
if pid == 0:
print('I am child process (%s) and my parent is %s.' % (os.getpid(), os.getppid()))
else:
print('I (%s) just created a child process (%s).' % (os.getpid(), pid))
https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001431927781401bb47ccf187b24c3b955157bb12c5882d000
os.fork()方法，使用在linux /Unix系统，不在windows下使用，如果在windows下使用，报错；
Process (21132) start...
Traceback (most recent call last):
File "E:/soft/pycharm/workplace/1.py", line 5, in <module>
pid = os.fork()
AttributeError: module 'os' has no attribute 'fork'
