how to use shapes in tkinter code example

Example 1: tkinter draw squaer

canvas.create_rectangle(30, 10, 120, 80,
    outline="#fb0", fill="#fb0")

Example 2: tkinter draw squaer

from Tkinter import *
master = Tk()

w = Canvas(master, width=250, height=200)
w.create_rectangle(0, 0, 100, 100, fill="blue", outline = 'blue')
w.create_rectangle(50, 50, 100, 100, fill="red", outline = 'blue') 
w.pack()
master.mainloop()

Example 3: tkinter draw circle

from tkinter import *
root = Tk()
myCanvas = Canvas(root)
myCanvas.pack()

def create_circle(x, y, r, canvasName): #center coordinates, radius
    x0 = x - r
    y0 = y - r
    x1 = x + r
    y1 = y + r
    return canvasName.create_oval(x0, y0, x1, y1)

create_circle(100, 100, 20, myCanvas)
create_circle(50, 25, 10, myCanvas)
root.mainloop()