Python 默认如何读取命令行 arguments

Question

I'm using Python with the command prompt and but I want to change the default setting for command line arguments to program read from stdin. I can have it this way by using the '-' before command line arguments but I want it to be read from stdin by default, so that the command line arguments appear in sys.argv without the '-'. How can I do this?

Answer 1

If I understood your question write you can do the following:

create master.py file:

import subprocess as sp

if __name__ == "__main__":
    subprocess = sp.Popen(["python", "child.py"], stdin=sp.PIPE)
    # pay attention stdin=sp.PIPE, otherwise you would not be able to send data to child subprocess
    subprocess.communicate("Hi There\nDear Friend\nBye".encode('utf8')) # we send data here

create child.py - it will be started from master process master.py

import sys

if __name__ == "__main__":
    for line in sys.stdin.read().split("\n"):  # read data from master process
        print(line + "!!!")

Start master process. You are supposed to get: Hi There!!! Dear Friend!!! Bye!!!

I hope it was helpful answer, if not please let me know.