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# Python2.x Python Exercise Instance 58 [ Python 100 Examples](#) **Question:** Drawing, learning to use rectangle to draw squares. **Program Analysis:** rectangle(int left, int top, int right, int bottom) Parameter description: (left, top) is the top-left coordinate of the rectangle, (right, bottom) is the bottom-right coordinate of the rectangle, the two can determine the size of a rectangle. ## Instance (Python 2.0+) #!/usr/bin/python# -*- coding: UTF-8 -*-if __name__ == ' __main__ ': from Tkinter import * root = Tk()root.title('Canvas')canvas = Canvas(root,width = 400,height = 400,bg = 'yellow')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