python subprocess.Popen freezes tkinter window

Asked May 21 '19 at 11:34

Active May 21 '19 at 11:39

Viewed 373 times

Firstly, I create an Tkinter window that contains a button and that button triggers the function that creates new subprocess but after creating new subprocess my first window doesn't respond. I am using python 3.7

(It happens even if I launch new subprocess that contains just a window and nothing else)

Here is my code

from tkinter import *
import pickle
import sys
import subprocess


def bom(exitX, exitY, startY, startX, entries1):

    theproc = subprocess.Popen([sys.executable, "Learner.py"], stdin=subprocess.PIPE)
    theproc.communicate()


masterq = Tk()

##..some gui code..##

Button(masterq, text='SAVE GRID - START AND END POINTS',
       command=lambda: bom(e1.get(), e2.get(), e3.get(), e4.get(), entries)).grid(
    row=4,
    column=0,
    sticky=W,
    pady=4)

masterq.mainloop()

edited May 21 '19 at 11:39

asked May 21 '19 at 11:34

Emre Akcan

the code is python 3 since t in tkinter is small – Smart Manoj May 21 '19 at 11:37
@SmartManoj Oh, mistyped I edited thanks. – Emre Akcan May 21 '19 at 11:40
1

I guess it is because `communicate()` blocks the thread. See https://stackoverflow.com/questions/2133345/python-subprocess-communicate-block – May 21 '19 at 11:49
@Poolka I thought communicate prevents blocking ! I delete the line and it worked ! thanks ! – Emre Akcan May 21 '19 at 12:03

python subprocess.Popen freezes tkinter window

0 Answers0