第一个例子是有错误还是我理解不当？

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#1 Created at ... [Delete] [Delete and Lock User]

print('I am child process (%s) and my parent is %s.' % (os.getpid(), os.getppid())) 结果：I am child process (877) and my parent is 876.

变量都是os.getpid()，为什么结果会不同？

应该是 print('I am child process (%s) and my parent is %s.' % (pid, os.getppid()) 这样吗？

#2 Created at ... [Delete] [Delete and Lock User]

父子进程的概念你理解的对

#3 Created at ... [Delete] [Delete and Lock User]

父子进程的概念你理解的不对

#4 Created at ... [Delete] [Delete and Lock User]

print('I am child process (%s) and my parent is %s.' % (os.getpid(), os.getppid()))

第一个是os.getpid()，第二个是os.getppid() 一个是PID，是自己的，一个是PPID，是父进程的。