From DO_PyEZ_Cookbook.pdf successful tkinter

tkinter_PyEZ.py

'''
C:\Python389\python.exe -m pip install --upgrade pip
C:\Python389\Scripts\pip3.8.exe install virtualenv
C:\Python389\python.exe -m virtualenv -p="C:\Python389\python.exe" virtenv
Activate.bat
C:\Python389\Scripts\pip3.8.exe install junos-eznc 
C:\Python389\python.exe
From https://www.juniper.net/documentation/en_US/day-one-books/DO_PyEZ_Cookbook.pdf
Recipe 14 - Adding a Graphical Interface to the PyEZ Script by Peter Klimai

tkinter buttons not fully added
'''

from tkinter import *
from jnpr.junos import Device
from jnpr.junos.exception import *
from pprint import pformat
from lxml import etree

USER = 'lab'
PASSWD = 'lab123'
DEVICE_IP = '10.254.0.35'

def output(st):
    text.insert(END, chars=st)
    text.see(END)

def read_and_display(message, function): 
    output(message)
    try:
        with Device(host=entry_dev.get(), user=entry_user.get(), password=entry_pw.get()) as dev:
            res = function(dev)
    except ConnectRefusedError:
        print('\nError: Connection refused!\n')
    except ConnectTimeoutError:
        output('\nConnection timeout error!\n')
    except ConnectUnknownHostError:
        output('\nError: Connection attempt to unknown host.\n')
    except ConnectionError:
        output('\nConnection error!\n')
    except ConnectAuthError:
        output('\nConnection authentication error!\n')
    else:
        output(res)

def print_facts(): 
    read_and_display('\nDevice facts:\n', lambda dev: pformat(dev.facts))

def show_bgp(): # (6)
    read_and_display('\nBGP summary information:', lambda dev: dev.rpc.get_bgp_summary_information({'format': 'text'}).text)

def show_intf(): # (7)
    read_and_display('\nInterface information:', lambda dev: dev.rpc.get_interface_information({'format': 'text'}, terse=True, normalize=True).text)

def show_route():
    read_and_display('\nManually type commands:', lambda dev: dev.display_xml_rpc('show route', format='text').text)

def show_software_information():
    #invoke the RPC equivalent to "show version"
    read_and_display('\nSoftware information:', lambda dev: etree.tostring(dev.rpc.get_software_information({'format':'text'}), encoding='unicode')) 

def show_route():
    read_and_display('\nManually type commands:', lambda dev: dev.rpc.get_route_information(table='inet.0', dev_timeout=55).text)


def main(): # (8)
    global entry_dev, entry_user, entry_pw, text
    root = Tk() # (9)
    Frame(root, height=10).grid(row=0) # (10)
    Label(root, text='Device address:').grid(row=1, column=0) # (11)
    entry_dev = Entry(root) # (12)
    entry_dev.grid(row=1, column=1)
    entry_dev.insert(END, DEVICE_IP)
    Label(root, text='Login:').grid(row=2, column=0) # (13)
    entry_user = Entry(root)
    entry_user.grid(row=2, column=1)
    entry_user.insert(END, USER)
    Label(root, text='Password:').grid(row=3, column=0) # (14)
    entry_pw = Entry(root, show='*')
    entry_pw.grid(row=3, column=1)
    entry_pw.insert(END, PASSWD)
    Frame(root, height=10).grid(row=4) # (15)
    Button(root, text='Read facts!', command=print_facts).grid(row=5, column=0)
    Button(root, text='Show interfaces!', command=show_intf).grid(row=5, column=1)
    Button(root, text='Show BGP!', command=show_bgp).grid(row=5, column=2)
    Frame(root, height=10).grid(row=6)
    frame = Frame(root, width=800, height=700) # (16)
    frame.grid(row=7, column=0, columnspan=4)
    frame.grid_propagate(False)
    frame.grid_rowconfigure(0, weight=1)
    frame.grid_columnconfigure(0, weight=1)
    text = Text(frame, borderwidth=3)
    text.config(font=('courier', 11), wrap='none')
    text.grid(row=0, column=0, sticky='nsew', padx=2, pady=2)
    scrollbarY = Scrollbar(frame, command=text.yview) # (17)
    scrollbarY.grid(row=0, column=1, sticky='nsew')
    text['yscrollcommand'] = scrollbarY.set
    scrollbarX = Scrollbar(frame, orient=HORIZONTAL, command=text.xview)
    scrollbarX.grid(row=1, column=0, sticky='nsew')
    text['xscrollcommand'] = scrollbarX.set
    root.mainloop() # (18)

if __name__ == '__main__': # (19)
    main()