Tkinter入门
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# Options

The following options can be used with the `pack` and `pack_configure` methods:

Table 35-1. Pack Manager Options

Option | Type | Description
--- | --- | ---
`side` | constant | Specifies which side to pack the widget against. To pack widgets vertically, use `TOP` (default). To pack widgets horizontally, use `LEFT`. You can also pack widgets along the `BOTTOM` and `RIGHT` edges. You can mix sides in a single geometry manager, but the results may not be what you expect. While you can create pretty complicated layouts by nesting `Frame` widgets, you may prefer using the `grid` geometry manager for all non-trivial layouts.
`fill` | constant | Specifies whether the widget should occupy all the space given to it by the master. If `NONE` (default), keep the widget's original size. If `X` (horizontally), `Y` (vertically), or `BOTH`, fill the given space along that direction. To make a widget fill the entire master widget, set `fill` to `BOTH` and `expand` to a non-zero value.
`expand` | flag | Specifies whether the widgets should be expanded to fill any extra space in the geometry master. If zero (default), the widget is not expanded.
`in (in_)` | widget | Pack widget inside the given widget. You can only pack a widget inside its parent, or in any decendant of its parent. This option should usually be left out, in which case the widget is packed inside its parent. Note that `in` is a reserved word in Python. To use it as a keyword option, append an underscore (`in_`).

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