widget can be used to display any data that have a hierarchical
structure, for example, file system directory trees. The list entries
are indented and connected by branch lines according to their places
in the hierachy.
widget displays a list of items to be selected by the user. CheckList
acts similarly to the Tk checkbutton or radiobutton widgets, except it
is capable of handling many more items than checkbuttons or
widget can be used to display hierachical data in a tree form. The
user can adjust the view of the tree by opening or closing parts of
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