Python Forum

Hello to all.
I created a frame and two buttons, I assigned two functions to the buttons, one closes the window, the other displays the / etc / fstab file in the shell.
I would like to be able to view the output of the second function within the frame.

from tkinter import *
import os

#window
mywin=Tk()

#function about to close window
def close_window (root): 
    root.destroy()

#function about to read fstab
def fstab():
    os.system("cat /etc/fstab")

#size window
mywin.geometry("600x400+600+100")
mywin.title('WINDOW')

#text in window
mytext=Label(text='View', fg='white', bg='black', font=('Helvetica',30)).pack()

#button GO!
gobutton=Button(text='GO!', command = fstab).pack()

#frame for my output
myframe=Frame(width=300, height=300).pack()

#button Exit
exitbutton=Button (mywin, text="Exit", command = lambda: close_window(mywin)).pack()

#go mainloop
mywin.mainloop()

Note that you have to have read permission on fstab (Code not tested so post back if there are errors that you can not fix) Pmw has a ScrolledFrame if you want to install it https://pypi.org/project/Pmw/

def fstab():
    records=open("/etc/fstab", "r").readlines()

    listbox = Listbox(mywin, height=6, width=20, font=('Fixed', 14),
                      foreground='blue' )
    scrolly = Scrollbar(mywin, command=listbox.yview )
    listbox.configure(yscrollcommand=scrolly.set)

    for item in records:
        listbox.insert("end", item)
    scrolly.pack(side="right", fill="y")

(May-25-2018, 07:57 PM)woooee Wrote: [ -> ]Note that you have to have read permission on fstab (Code not tested so post back if there are errors that you can not fix) Pmw has a ScrolledFrame if you want to install it https://pypi.org/project/Pmw/

Thank you so much for your answer. I tried to use your code by editing my file this way

from tkinter import *
 
#window
mywin=Tk()
 
#function about to close window
def close_window (root): 
    root.destroy()
 
#function about to read fstab
def fstab():
    records=open("/etc/fstab", "r").readlines()
 
    listbox = Listbox(mywin, height=6, width=20, font=('Fixed', 14),
                      foreground='blue' )
    scrolly = Scrollbar(mywin, command=listbox.yview )
    listbox.configure(yscrollcommand=scrolly.set)
 
    for item in records:
        listbox.insert("end", item)
    scrolly.pack(side="right", fill="y")
 
#size window
mywin.geometry("600x400+600+100")
mywin.title('WINDOW')
 
#text in window
mytext=Label(text='View', fg='white', bg='black', font=('Helvetica',30)).pack()
 
#button GO!
gobutton=Button(text='GO!', command = fstab).pack()
 
#button Exit
exitbutton=Button (mywin, text="Exit", command = lambda: close_window(mywin)).pack()
 
#go mainloop
mywin.mainloop()

as you suggested, I installed pwm.
on the screen appear the vertical scroll bar, but without, unfortunately, return, no code in the new output.

You have to pack the listbox for it to show listbox.pack(side="left") It is best if you learn to figure out how to do this for yourself.

thank you so much! I studied the Tkinter Listbox functions, now I understand !!
now I would like to take a look at Pwm which I installed, but not used.
what I would like to know now , if I can take advantage of your availability, is how to give an executable command, for example /usr/bin/lsblk or /usr/bin/sensors.

I tried this way:

import subprocess

def lsblk():
    records = subprocess.Popen('/usr/bin/lsblk', shell=True).readlines()

in this way, I display the output in bash.
I'm returning this error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1702, in __call__
    return self.func(*args)
  File "os.py", line 20, in lsblk
    records  =subprocess.Popen('/usr/bin/lsblk').readlines()
AttributeError: 'Popen' object has no attribute 'readlines'

my version python 3.6 and 2.7
I use as os arch linux

finally I succeeded!
I have directed the output of the process in an external file and then open it, making sure I have read permission, with the usual built-in "open" function
then I place the code if this to someone can to be help:

import os
def lsblk():
    os.system('lsblk >outfile')
    records=open('outfile', 'r').readlines()