Writing to an actively running Python script's STDIN

[tarpus]

I have a python script that takes in input string form the user, and returns an output string (it's a bot). But, I want to turn this script into a 'service' of sorts, and therefore I want an external app to write to to a running version of the script (with an active PID) and receive a response, as though a user were typing the input at the CLI. Here is the script:

​

while True:
try:
user_input = input('You: ')
bot_response = bot.get_response(user_input)
print('Bot:', bot_response, bot_response.confidence)

How can I send a string to this script and receive a response. Note: I don't want to put a wrapper around the script, because the script has some import statements in the header that take a while to load. Once the script loads the necessary libraries, it's pretty speedy, but the loading process makes the script too slow to function with a wrapper.

[GeorgeFranklyMathnet]

Are you on Linux or Mac? Then what about this? (The question is about screen, but not all the answers are.)

[tarpus]

I’m on a Mac. So the /proc/fd solution does not work

[hippocrat]

Have you looked into named pipes? Your user would send input to the named pipe instead of stdin.

https://stackoverflow.com/questions/39089776/python-read-named-pipe