Frame component of tkinter window development

Frame: The frame, used to carry and place other GUI elements, is a container, which is a WindowsSeparate small areasofpart, It can divide Windows into different areas, and then store different other components. At the same time, a Frame can also be divided into two Frames. Frame can be considered as a container, similar to the front-end div tag

import tkinter as tk
from PIL import Image, ImageTk  # pillow module python image processing library

# Step 1, instantiate object, create window
window = tk.Tk()

# Step 2, give a name to the visualization of the window
window.title("this is wyh's GUI window")

# Step 3, set the size of the window (length * width)
window.geometry('800x500')  # The multiplication here is small x

# Step 4, set the display label on the graphical interface and place the controls

var = tk.StringVar()
var.set("Here is the display bar!!!")

l1 = tk.Label(window, textvariable=var, bg='teal', fg='white', font=('Arial', 12), width=800, height=5)
l1.pack()

# Step 5, create a main frame, which grows on the main window
frame = tk.Frame(window)
frame.pack()

# Step 6, create a second layer of frame, grow on top of the main frame
frame_01 = tk.Frame(frame)  # The second layer of frame, which grows on the main frame
frame_02 = tk.Frame(frame)  # The second layer of frame, which grows on the main frame
frame_03 = tk.Frame(frame)  # The second layer of frame, which grows on the main frame
frame_04 = tk.Frame(frame)  # The second layer of frame, which grows on the main frame
frame_01.pack(side='top')
frame_04.pack(side='bottom')
frame_02.pack(side='left')
frame_03.pack(side='right')

# Step 7, create three sets of labels, which are the content on the second layer of the frame, divided into left and right areas, marked with different colors
tk.Label(frame_01, text='on the frame_01', bg='red', width=800, height=10).pack()
tk.Label(frame_02, text='on the frame_02', bg='blue', width=110, height=10).pack()
tk.Label(frame_03, text='on the frame_03', bg='yellow', width=110, height=10).pack()
tk.Label(frame_04, text='on the frame_04', bg='green', width=400, height=10).pack()

# Step 6, the main window cyclically displays
window.mainloop()