python: windowing and making graphs

#圆
from tkinter import *

canvas = Canvas(width=800, height=600, bg= ' yellow ' ) #declare window properties 
canvas.pack(expand=YES, fill= BOTH)
k = 1
j = 1
for i in range(0, 26):
    canvas.create_oval(310 - k, 250 - k, 310 + k, 250 + k, width=1)#画圆
    k += j
    j += 1 
mainloop() #Execute the entire function

Results of the:

#Line from tkinter import * 
canvas =Canvas(width=300,height=300,bg= ' white ' ) #declare 
window properties canvas.pack 
(expand=YES,fill=BOTH) #execute window properties 
x0 = 260 #declare coordinates 
y0 = 260 
y1 = 90
 for i in range(10 ):
        canvas.create_line(x0,y0,x0,y1, width =1, fill= ' red ' ) #Draw a line 
        x0 = x0 - 5 
        y0 = y0 - 5 
        y1 = y1 + 5 
mainloop() #Execute the entire function

Results of the:

#Rectangle from tkinter import * 
canvas =Canvas(width=300,height=300,bg= ' white ' ) #declare 
window properties canvas.pack 
(expand=YES,fill=BOTH) #execute window properties 
x0 = 263 
y0 = 263 
y1 = 275 
x1 = 275
 for i in range(19 ):
    canvas.create_rectangle(x0, y0, x1, y1)
    x0 -= 5 
    y0 -= 5 
    x1 += 5 
    y1 += 5 
mainloop ()

Results of the: