from tkinter import Tk, Frame, BOTH, YES
import os, sys
from multiprocessing import Process

def GUI():
    sys.stdout = open(str(os.getpid()) + ".out", "w")
    root = Tk()
    root.resizable(False, False)
    termf = Frame(root, height=400, width=600)
    termf.pack(fill=BOTH, expand=YES)
    wid = termf.winfo_id()
    os.system('xterm -into %d -geometry 96x30 -sb -hold -e "tail -f loading.py" &' % wid)
    root.mainloop()

process = Process(target=GUI)
process.start()

input("Enter command:")
--------------
zenix@linux-xk05:~/Desktop> python a.py
Enter command:Traceback (most recent call last):
  File "a.py", line 18, in <module>
    input("Enter command:")
EOFError