I think this will do close to what you want. It uses subprocess.Popen()
instead of os.system()
to run the other script and rerun the pop-up which doesn’t block execution while waiting for them to complete, so they can now execute concurrently.
I also added a Quit button to get out of the loop.
import subprocess
import sys
from tkinter import *
import tkinter as tk
root = Tk()
def sample_function():
command = f'"{sys.executable}" "other_python_file.py"'
subprocess.Popen(command) # Run other script - doesn't wait for it to finish.
root.quit() # Make mainloop() return.
tk.Button(text='Run sample_function', command=sample_function).pack(fill=tk.X)
tk.Button(text='Quit', command=lambda: sys.exit(0)).pack(fill=tk.X)
tk.mainloop()
print('mainloop() returned')
print('restarting this script')
command = f'"{sys.executable}" "{__file__}"'
subprocess.Popen(command)
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