'NoneType' object has no attribute 'get'

[deanhystad]

Post entire error message, including trace.

This is your problem:

e = Entry(root, text = "Message").grid(row=10, column = 5)

Entry(root, text = "Message") returns a tkEntry widget.

.grid(row=10, column = 5) returns None

When you daisychain the two together, Entry(root, text = "Message").grid(row=10, column = 5 returns None. All of the variables you assigned to widgets are None. myLabel1 == None, myButton3 == None, and, of course, e == None.

You don't use any of those variables, other than e, so don't assign the widget to a variable. For e, I think you should do something different. You can directly get or set text from an Entry widget, but I would use a tkinter StringVar. Like this:

import tkinter as tk  # Do not use wildcard import

bg = "black"
fg = "white"


# It is convention to put functions near top.
def encrypt():
    """Functions should have a docstring saying what they do."""
    label.set("I clicked Encrypt!")


# Instead of creating new labels, change the text of the existing label.
def decrypt():
    """I am called by the copy button?"""
    label.set(entry.get())


root = tk.Tk()
root.configure(background=bg)

entry = tk.StringVar(root, "Message")  # Use this to get text from entry widget
tk.Entry(root, textvariable=entry).grid(row=10, column=5)

# Do not put multiple widgets in same grid location
label = tk.StringVar(root, "")  # Use this to set text of the label.
tk.Label(root, textvariable=label, bg=bg, fg=fg).grid(row=0, column=1)

# If you don't use a variable, don't create one.
tk.Label(root, text="Hello World!", bg=bg, fg=fg).grid(row=0, column=0)
tk.Label(root, text="My Name is Bob!", bg=bg, fg=fg).grid(row=1, column=1)
tk.Button(root, text="Encrypt", command=encrypt, fg=fg, bg=bg).grid(row=2, column=1)
tk.Button(root, text="Decrypt", state=tk.DISABLED, padx=50).grid(row=3, column=1)
tk.Button(root, text="Copy", command=decrypt).grid(row=4, column=1)

root.mainloop()

This is the code without using StringVar. Setting the entry text becomes difficult. I also removed the fg and bg setting stuff. If you want to change the window appearance, use ttk widets and themes. I repurposed the copy button to randomly change the theme for the window when clicked.

import tkinter as tk  # Do not use wildcard import
from tkinter import ttk
import random


def encrypt():
    label["text"] = "I clicked Encrypt!"


def decrypt():
    label["text"] = entry.get()


def change_theme():
    theme = random.choice(style.theme_names())
    label["text"] = theme
    style.theme_use(theme)


root = tk.Tk()
style = ttk.Style(root)

entry = ttk.Entry(root)
entry.insert(0, "Message")  # This is why you use a StringVar.
entry.grid(row=10, column=5)

label = ttk.Label(root, text="")
label.grid(row=0, column=1)

# If you don't use a variable, don't create one.
ttk.Label(root, text="Hello World!").grid(row=0, column=0)
ttk.Label(root, text="My Name is Bob!").grid(row=1, column=1)
ttk.Button(root, text="Encrypt", command=encrypt).grid(row=2, column=1)
ttk.Button(root, text="Decrypt", command=decrypt).grid(row=3, column=1)
ttk.Button(root, text="Copy", command=change_theme).grid(row=4, column=1)

root.mainloop()