[Python] NameError: name 'Frame' is not defined (Python)

I have constructed a messaging application, but it seems to have incorrect syntax:

from tkinter import messagebox


from AESEncDec import *
from MD5Hashing import *
from RSAEncDec import *

color = 'lightblue' #color our background


class Application(Frame):

def __init__(self, root=None):

Frame.__init__(self, root)
self.frame_width = 700
self.frame_height = 400

# Set configuration our frame
self.config(width = self.frame_width, height = self.frame_height, bg = color)
self.pack()

# Create textBox for input data
self.textbox_one = Text()
self.textbox_one.place(x = 30, y = 170, height = 200, width = 300 )

# Create textBox for result
self.textbox_two = Text()
self.textbox_two.place(x = 370, y = 170, height = 200, width = 300 )

label_input_text = Label( text = "Input text: ", bg = color)
label_input_text.place(x = 30, y = 155, height = 10, width = 70 )


During execution I get the following error:

Traceback (most recent call last): File "/home/artur/Documents/MScProject/MSc Project/Task #179276/main_program.py", line 11, in class Application(Frame): NameError: name 'Frame' is not defined
​

What might be the problem?

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