import tkinter as tk

def add_pi():

    # Configure the window and define addpi
    addpi = tk.Tk()
    addpi.geometry("600x400")
    addpi.title("Add A Slice Of Pi")
    addpi.configure(bg = "black")

    # declaring string variable for storing name and password
    hostname = tk.StringVar()
    username = tk.StringVar()
    password = tk.StringVar()
    #pi = { 'hostname' : "hostname", 'username' : "username", 'password' : "password" }

    def accept_button ():
        #pi['hostname'] = hostname.get()
        #pi['username'] = username.get()
        #pi['password'] = password.get()
        #print ( "Hostname = " + pi['hostname'] )
        #print ( "Username = " + pi['username'] )
        #print ( "Password = " + pi['password'] )

        pi_host = hostname.get()
        pi_user = username.get()
        pi_pass = password.get()

        print (f"Host: {pi_host}  User: {pi_user}  Password: {pi_pass}")

        hostname.set("")
        username.set("")
        password.set("")

    # Window components
    label_hostname = tk.Label(addpi, text = "Hostname:", bg = "black", fg = "white", justify = "right").grid(row = 0, column = 0, padx = 10, pady = 10)
    entry_hostname = tk.Entry(addpi, textvariable = hostname, width = "35", bg = "white", fg = "black").grid(row = 0, column = 1)
    label_user = tk.Label(addpi, text = "User:", bg = "black", fg = "white", justify = "right").grid(row = 1, column = 0, padx = 10, pady = 10)
    entry_user = tk.Entry(addpi, textvariable = username, width = "35", bg = "white", fg = "black").grid(row = 1, column = 1)
    label_password = tk.Label(addpi, text = "Password:", bg = "black", fg = "white", justify = "right").grid(row = 2, column = 0, padx = 10, pady = 10)
    entry_password = tk.Entry(addpi, textvariable = password, width = "35", show = "*", bg = "white", fg = "black").grid(row = 2, column = 1)
    butt_cancel = tk.Button(addpi, text = "Cancel", bg = "blue", fg = "white", height = 1, command = addpi.destroy)\
            .grid(row = 3, column = 0, padx = 10, pady = 10, sticky = "w")
    butt_accept = tk.Button(addpi, text = "Accept", bg = "blue", fg = "white", height = 1, command = accept_button)\
            .grid(row = 3, column = 1, padx = 10, pady = 10, sticky = "e")

    # Main loop
    addpi.mainloop()

root = tk.Tk()
root.geometry("640x480")
root.title("A Python App")
root.configure(bg='black')

button = tk.Button(root, text = "Add a Pi", bg = "blue", fg = "white", width = 10, height = 1, command = add_pi)
button.place(x = 10, y = 10)

root.mainloop()