frame, gridの使い方(python,tkinter)

import tkinter

app = tkinter.Tk()
app.geometry("400x400")

# フレーム作成
frame1 = tkinter.Frame(app,)
frame2 = tkinter.Frame(app,)
frame3 = tkinter.Frame(app,)
frame4 = tkinter.Frame(app,)

frame1.grid(column=0,row=0)
frame2.grid(column=1,row=0)
frame3.grid(columnspan=2,column=0,row=1)
frame4.grid(rowspan=2,column=2,row=0)

# ウィジェット配置
button = tkinter.Button(frame1,text="ボタン",)
button.pack()

label = tkinter.Label(frame2,text="ラベル")
label.pack()

canvas = tkinter.Canvas(frame3,width=300,height=300,bg="gray")
canvas.pack()

canvas1 = tkinter.Canvas(frame4,width=50,height=330,bg="blue")
canvas1.pack()

app.mainloop()