The top of the box is positioned 23 pixels below the top of our original canvas.
方框的顶部距离原始画布的顶部 23 像素。
After the loop, another canvas, password text box, and Submit button are created and packed into the Tk main window.
在循环完成后，另一套画布、密码文本框和Submit按钮将被创建并封装到t k主窗口中。
When you drop the Box widget onto the canvas, you are prompted to give this instance of the Box widget a name.
在将Box小部件放入到这个canvas时，系统会提示您，为这个Box小部件的实例提供一个名称。
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