Dismal v0.7MP

"""
Dismal v0.7MP (short for Disposable Email)
For Windows and Linux.

Extremely simple desktop GUI to create
a disposable email address and go to
the inbox, all  accomplished in a few seconds
and just a few clicks.

By Steve Shambles Oct 2018.
Updated Nov 2019.
https://stevepython.wordpress.com/

pip3 install pyperclip
"""
from tkinter import Button, E, Entry, LabelFrame, Menu
from tkinter import messagebox, Tk, W
from random import randint, choice
import string
import sys
import webbrowser

import pyperclip

base_url = 'https://www.mailinator.com/v3/index.jsp?zone=public&query='
base_email = '@mailinator.com'

root = Tk()
# Stop early showing of GUI until messagebox clicked.
root.withdraw()

messagebox.showinfo('Mailinator GUI', 'To create a quick disposable, anonymous'
                    ' email address,\nJust type some text (to create a user '
                    'name) into the input box,\nthen click on the Create Email '
                    'button\n\nIf you type nothing in, a random name'
                    ' will be generated for you.')

# Create GUI frame.
root = Tk()
root.title('Dismal v0.7')

if sys.platform.startswith('win'):
    root.geometry('173x110')
    root.resizable(False, False)
else:
    root.geometry('194x115')

main_frame = LabelFrame(root)
main_frame.grid(padx=5, pady=8)

def clk_but():
    """Create Email button was clicked"""
    # Get content of entry box.
    e_name = entry_box.get()

    if not e_name:
        # If no username entered, create random one.
        allchar = string.ascii_lowercase + string.digits
        e_name = ''.join(choice(allchar) for x in range(randint(6, 8)))

    # Construct email address.
    email_address = e_name+base_email

    messagebox.showinfo('Info', 'your new email address is '
                        +str(email_address)+'\n\n'
                        'The address has been copied to your clipboard.\n'
                        'Click OK to go to your inbox')

    # Copy email address to clipboard.
    pyperclip.copy(email_address)

    # Open inbox in browser.
    webbrowser.open(base_url+e_name)

def about_menu():
    """About program."""
    messagebox.showinfo('About',
                        'Dismal V0.7 By Steve Shambles 2018.\n'
                        'Updated Nov 2019.')

def visit_blog():
    """Visit my blog."""
    webbrowser.open('https://stevepython.wordpress.com/')

# Create entry box.
entry_box = Entry(main_frame, bd=3, bg='slategray1')
entry_box.grid(sticky=W+E, padx=5, pady=5)

# Create Email button.
create_mail_btn = Button(main_frame, bg='salmon', text='Create Email',
                         command=clk_but)
create_mail_btn.grid(pady=15, padx=15)

# Standard dropdown menu.
menu_bar = Menu(root)
file_menu = Menu(menu_bar, tearoff=0)
menu_bar.add_cascade(label='Menu', menu=file_menu)
file_menu.add_command(label='Visit Blog', command=visit_blog)
file_menu.add_separator()
file_menu.add_command(label='About', command=about_menu)
file_menu.add_command(label='Exit', command=root.destroy)
root.config(menu=menu_bar)

root.mainloop()