题目：画椭圆。
程序分析：使用 Tkinte云计r。
在使用Python的tkinter库进算开行界面绘图时，必须要用到的就是设置Can发：vas画布，熟悉tkinter库的小伙伴应该都Py知道这个函数。
程序源代码：
以上实例输出结果为：
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