题目：画图，学用rectangle画方形。
程序分析：
rectangle(int left,int top,int right,int bottom)
参数说明：(left ，top )为矩形的左上坐标，(right,bottom)为矩形的右下坐标，两者可确定一个矩形的大小
实例(Python 2.0+)
#!/usr/bin/python# -*- coding: UTF-8 -*-if__name__ == '__main__': fromTkinterimport * root = Tk() root.title('Canvas') canvas = Canvas(root,width = 400,height = 400,bg = 'yellow') x0 = 263 y0 = 263 y1 = 275 x1 = 275 foriinrange(19): canvas.create_rectangle(x0,y0,x1,y1) x0 -= 5 y0 -= 5 x1 += 5 y1 += 5 canvas.pack() root.mainloop()
