对于派生进程，stdout和stdin会发生什么？

Question

I understand the fork function.I know that it duplicates the parent process and after the fork function has been called the parent complete its execution and the child start its execution. Here is a python code the fork a child process

import os
pid, master_fd =os.forkpty()
if pid == 0:
    print ('child')
else:
   print ('parent') 

Why is the word child doesn't get printed??

Answer 1

The word "child" doesn't appear because os.forkpty() creates a new pseudo-terminal and routes the child's output to it.

Your understanding would be correct if you had used os.fork() instead.