Python tkinter Display CLI result on GUI

Question

I have 2 python files. one is helloworld.py and 2nd is main.py. In main.py there is button.When i click on that button that time I want to print result of helloworld.py into text box.

helloworld.py

print("hello world")

so I want to print hello world string into main.py textbox

from tkinter import *
import os
root= Tk()
root.title("My First GUI")
root.geometry("800x200")
frame1=Frame(root)
frame1.grid()

def helloCallBack():
     result = os.system('python helloworld.py')
     if result==0:
         print("OK")
         text1.insert(END,result)        
     else:
         print("File Not Found")

label1 = Label(frame1, text = "Here is a label!")
label1.grid()

button1 = Button(frame1,text="Click Here" , foreground="blue",command= helloCallBack)
button1.grid()

text1 = Text(frame1, width = 35, height = 5,borderwidth=2)
text1.grid()

radiobutton1 = Radiobutton(frame1, text= "C Programming", value=0)
radiobutton1.grid()
radiobutton2 =Radiobutton(frame1, text= "Python Programming")
radiobutton2.grid()
root.mainloop()

Answer 1

Use subprocess.check_output instead of os.system :

from tkinter import *
from subprocess import check_output, CalledProcessError

root = Tk()

text1 = Text(root)
text1.pack()

def command():
    try:
        res = check_output(['python', 'helloworld.py'])
        text1.insert(END, res.decode())
    except CalledProcessError:
        print("File not found")

Button(root, text="Hello", command=command).pack()

root.mainloop()