报错：
_tkinter.TclError: cannot use geometry manager pack inside . which already has slaves managed by grid
原因：
一个程序中，只能使用一种布局，否则会报上面的错误。
| 几何方法 | 描述 |
| pack() | 包装； |
| grid() | 网格； |
| place() | 位置； |
python3 tkinter报错：_tkinter.TclError: cannot use geometry manager pack inside . which already has slaves managed by grid
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