Interactively communicating with a FORTRAN shell program

Question

DAOPHOT is a FORTRAN-written software for performing astronomy tasks in images. A typical flow of its usage is:

1. Open a terminal (gnome-terminal in my case) and run ./daophot. I'm now within DAOPHOT's shell.
2. Prompts the user for a command, let's say ATTACH to input an image file. DAOPHOT runs and prompts the user again for more commands.
3. User gives another command, let's say PHOTOMETRY. DAOPHOT runs and prompts the user again.

For every command the user gives, DAOPHOT runs and prompts again and again until exit is typed. For my case, I have three specific commands that will run one after another, without variation (ATTACH, PHOTOMETRY and PSF, with the latter maybe run more than once).

Right now I'm simply trying to ATTACH a file. What I have tried:

Using subprocess, as seen/asked here and here:

import subprocess

p = subprocess.Popen(["gnome-terminal","--disable-factory","--","./daophot"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
p.stdin.write(input("ATTACH file.fits"))

For this case, DAOPHOT's shell opens but the ATTACH command is not executed. I close the shell and the string "ATTACH file.fits" appears in the IPython terminal, ending the subprocess. I've tried also to use p.communicate(input=input("ATTACH file.fits")), but got the same result.

Using pexpect, as seen/asked here and here:

import pexpect

p = pexpect.spawn("gnome-terminal --disable factory -- ./daophot")
p.expect(pexpect.EOF)
p.sendline("ATTACH file.fits")

In this case, DAOPHOT's shell opens but the ATTACH command is not accounted for as an input.

Finally, a DAOPHOT wrapper already exists, but the idea is to have this automatically and interactive Python version in our lab, so that we can change later if needed.

From what I understand in terms of pipelines, ./daophot is a subsubprocess runnning inside gnome-terminal, so when I use e.g. p.stdin.write(input("ATTACH file.fits") I am actually inputing this command into gnome-terminal, and not into ./daophot.

Any help is much appreciated.