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Originally developed for use in IDLE. Based on tabpage.py.

Classes exported:
TabbedPageSet -- A Tkinter implementation of a tabbed-page widget.
TabSet -- A widget containing tabs (buttons) in one or more rows.

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        n_rows -- Number of rows of tabs to be shown. If n_rows <= 0 or is
        None, then the number of rows will be decided by TabSet. See
        _arrange_tabs() for details.

        max_tabs_per_row -- Used for deciding how many rows of tabs are needed,
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    of pages, using the name given as the key. A page is an instance of a
    subclass of Tk's Frame widget.

    The page widgets will be created (and destroyed when required) by the
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        TabbedPageSet will be initialized empty.

        n_rows, max_tabs_per_row -- Parameters for the TabSet which will
        manage the tabs. See TabSet's docs for details.

        page_class -- Pages can be shown/hidden using three mechanisms:

        * PageLift - All pages will be rendered one on top of the other. When
          a page is selected, it will be brought to the top, thus hiding all
          other pages. Using this method, the TabbedPageSet will not be resized
          when pages are switched. (It may still be resized when pages are
          added/removed.)

        * PageRemove - When a page is selected, the currently showing page is
          hidden, and the new page shown in its place. Using this method, the
          TabbedPageSet may resize when pages are changed.

        * PagePackForget - This mechanism uses the pack placement manager.
          When a page is shown it is packed, and when it is hidden it is
          unpacked (i.e. pack_forget). This mechanism may also cause the
          TabbedPageSet to resize when the page is changed.

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